Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍
For a year, I watched almost a hundred videos on UA-cam about oil viscosity and this is the only one that really explained it to me; thank you for your time and efforts
Craig, if all educators were like you, the world will be so much better. Not often I discover someone teach so eloquently and concisely. You really demystified this topic. The simplified chemistry near the end helped me finally understand how engine oil gets thicker when hotter instead of thinner. Bravo! Thank you!
I wanted to add: Great Video, don't you wish School was like that when you were growing up? Good teacher, good visuals, concepts in logical sequence. No Brats to disrupt your learning, and no Damned Test. UA-cam is Awesome.
sir, believe me, I have searched about the depth of the topic so much and watched about 70s of videos around UA-cam. but you are the one who actually solved my doubts about how an engine oil gets thicker with the rise of temperature, it should get thinner with the rise of temperature,but actually it's not like that.. it actually acts like a thicker engine oil when the temperature rises. .. I'm very thankful to you sir.. I'm from India🇮🇳. From today I'm watching your video.
i have not found a video in youtube that has a better discription an esplanation and breakdown that this video. all other videos are short quick tips that dont really mean all that much. But this video is so details and well structured. i now feel a lot more clued up and have a much better understanding and better grasp of what is happening and what to look out for in hte oil viscocity ranges. like i never new the viscocity range , ranges from 0 to 60 and no other video lists this. thank you for this well put tegother video
Fantastic rendetition! Out of hundreds of people simply babbling along just trying to explain oil weights you sir have made it very clear and easy to understand to what id like to think for anyone. Not only did you simplify and explain but you shed light on the deeper inner workings of the oil which is something ive always desired to know. Thank you sir very much.
A first-rate, excellent explanation for the layman. Clear, useful and easy to follow diagrams. No jargon, no 'sell', no promotion of any particular product. Thporoughly recommedned.
Thanks very much from Japan. (That is to say one bloke in Japan and not the whole nation :) ) That is a top class video. Appropriately simple and comprehensive in every part, nicely paced, nicely ordered, great graphics. I'd give you an award for it... if I were able. Now I know what it means that my bikes' manufacturers demand the use of such specific oils. In 1990 I was, very briefly, an apprentice mechanic at a Toyota dealer in the UK. I was not there long enough to learn this - bad relationship with the dealer manager. I feel I have gone up one grade from, say, level 20/100 to level 21/100.
Absolutely bloody outstanding - Thank you for a very clear and easy to understand explanation. I'll put Mobil 1 esp 0W - 40 in everything At least I now know why I'm paying more money !
Great explanation, but something is wrong. The oil does not get thicker when hot. By simply looking at it when pouring it from the bottle to an engine it is thick. And when draining the same hot oil from the engine which was still hot at the time of draining at about 100C. You can clearly see it pour down like water and by touching it you feel that it is less viscous than colder oil. I think the multi grade allows for less thickening when oil is hot compared to a single grade, and oil is the thickest when cold and gets thicker the lower the temperature and thinner the hotter the temperature, the VM doesn’t allow it to thin as much as it would have without the VM, yet still its thinner when hot than when cold. Looking at oil spec sheets. You can see different viscosities at 100c and 40c. Correct me if I’m wrong.
I understand your questioning of this, i really do, and you are right to question it, as many have. What I failed to do in this video is to better explain what I actually meant by this. In response, I have made another video, which I hope will help clear things up. You can find it here on you tube at: ua-cam.com/video/gmLASM9XcM4/v-deo.html I hope this helps. Thanks, Craig
Superb explanation, really appreciated. The only video I came across on UA-cam that explains oil behaviour in so much detail and so logically correct. Really appreciated.
5:50 that's why some older engines like my pickup truck have main bearing knocks on Startup and then after they get oil pressure they stop. It's also weird we live in a time where warm oil gets thicker and cold oil gets thinner completely opposite of what it should be great video man
Superb lesson, thank you so much! It all makes sense now. Reminded me when I was trying to visualize the lunar cycle in astronomy class. Get the right resources and be persistent !
Excellent job of explaining how it all works together. Maybe you could take one more step of how the different oils work themselves. The modern oils have changed a lot from the early days to cover different types of engines and requirements. Thank you.
Thanks very much for this and the last video Craig, I imagine it will have taken a while to produce them and they will be of help to me and I imagine others for a very long time. Nice to find someone new I want to subscribe to as well
The more modern synthetics use a lot less VII's. They start with a synthetic base oil which thickens less so can meet the spec of a 5W and an SAE30. The only additions i'd make to the vid is that it's not that the oil thickens with heat, it's that it gets less thin that it would have done without the VII's, the cst of the oil still goes down, just not as much. Also these bearing are hydrodynamic so the oil pressure built up by restriction of flow from the pump isn't doing anything directly to keep the metal parts separated. In a hydrodynamic bearing, the supplied oil is sucked in and forced out by the rotation of the journal. The rotation of the journal creates an oil wedge that the journal rides on, like a surfer. The restriction of flow prevents too much side leakage from the bearing to guarantee oil wedge integrity and no metal to metal contact. The oil system is usually pretty much primed because the oil pump is holding the oil in oilways the block.
Mr Craig, you are amazing! Many thanks for sharing this importante information...i would like to have a Professor like you! its so nice to hear you! many regards from Colombia, thanks!!
at last somebody has had the insight to explain carefully why oils get thicker when they get hotter when common sense dictates they should get thinner.....it's down to VM's and how solvents act on the bonds between them as temp rises making the bonds weaker so the VM's expand in size making the oil thicker.......great video
steviezxr...sorry but you have not understood the video...if you're right then 5w-30 is wrong....5w = viscosity at 0 deg ....but 30= viscosity at high temps (100 deg) according to you at higher temp the viscosity gets thinner and should drop below 5 but it does not due to the action of viscosity modifiers and solvents...they are activated by heat making this oil thicker at high temp...remember modern oils are not single grade but multigrade
that was a good explanation. learning initially that the oil is thick when cold and thin when hot... just when i was absorbing that idea , you gave a twist of " acts like 30 " after a minute of discrepancy , you introduced vm and solvent and again clarity came back... nice video.... hmmm but my sym scooter company manual recommended sae 10 w 30 and the mechanic recommended sae 20 w 30 ... i bought what the mechanic had recommended and he filled the tank... had i seen this video i would have gone for sae 10w 30... but may be sae 20w will act at higher temperature better than sae 10w..
Hi Craig, Thank you sharing the information in simple graphs and explanation with details. Would you please help me understand following: Mineral and Synthetic both oils are Multi grade right ? If yes then What is the difference in these both the oils? One difference I learned is uniformity (in terms of size) of Molecules. Thank you in advance.
Wow did not know how all that worked. Can you do an explanation on synthetic and how it works in the motor differently than standard oil or conventional oil. Thanks
Thank you sir for these full details. ...so...wide ranges of numbers could be better according to ur great explanation. ....as 5w-50 cover wider range of temps and better than 15w-40 as an example...isn't that? thanxs alot
Ali Hasan, yes absolutely. In my opinion the greater the gap between numbers will mean that the oil will adapt to suit the heat it is experiencing. When I say this, I am referring to the lower number only. The higher number ( e.g. 30) will have to be correct for the needs of the engine. I thought I had explained this but realised I hadn't and it was bought to my attention that I hadn't from the comment below (thank you for that). Anyway, the upper number (working temperature number) has to be correct for the engine as I've mentioned. If not, then as rightly explained below, the oil would either be too thick or too thin depending on the number. E.g. If an engine needs a 10W30, then a 10W50 would result in being too thick at working temperature. The issue really is only in the upper temp. I have known some users to use 0W30 for an engine requiring a 10W30. The range of numbers I was referring to, which should have been more clear about, was the lower numbers (cool running numbers). As the engine warms up the oil then will adapt to the heat of the engine up to the higher viscosity number and no higher. Apologies and I hope I've explained it better this time. Thank you.
"Better"? Not sure that's a god word to use. I wouldn't be putting a 5W-50 oil in a car that requires 5W-30. If 5w30 acts like a 30 (thick) at 100C, then a 5w50 will act like a 50 (thicker) at 100C, you could ruin your engine quicker, no?
I think of the Viscosity Modifier like egg whites: Egg white when it is cold is thin and runny. Add heat to it, and it becomes thicker, actually until it is solid. And Of Course while you can't reverse that reaction, essentially Viscosity Modifier can, many many times. Since an egg white is a protein (albumen) it is a large chain just like a polymer. I suppose acids build up eventually in the crankcase, along with other Carbon Nasties, and eventually the solvent evaporates off. And then, this otherwise reversable process gets less and less efficient as the oil/VM/Solvent ages. The acid buildup No Doubt "kicks" more of the Viscosity Modifier into staying thick and not being able to "thin out" over time... Just as if your poured some vinegar into a bowl of egg whites... They "curdle" like that which I would guess gets worse over time. It's pretty amazing that it can go through this process so many kilometres and last as long as it does, really. Question: Do you think that it's better to let a cold engine come up to temperature before you exert a load on it? I always wait a few minutes before I actually pull away from my house, thinking that things are better lubricated, so less wear. Do you do this? My car's always last a long time, as I change the oil at regular manufacturer intervals, let the engine warm up, and am very gentle with acceleration. (And stops.) We always had to let the temp be "in the green" when flying. Aside from aircraft, Semi Trucks you call them lorries I think, have many gears, to better balance the load. But even an unloaded truck, Truck Driver takes a long time to accelerate up to working speed. So I try to do the same thing. What is your practice/advice? 73 DE W8LV BILL
Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍
The best explanation on engine oil. No one has ever tried to simplify the oil mystery before.
Thank you so much for the nice feedback. I really appreciate it. Craig
For a year, I watched almost a hundred videos on UA-cam about oil viscosity and this is the only one that really explained it to me; thank you for your time and efforts
LOL, not real quick on the uptake?
Craig, if all educators were like you, the world will be so much better. Not often I discover someone teach so eloquently and concisely. You really demystified this topic. The simplified chemistry near the end helped me finally understand how engine oil gets thicker when hotter instead of thinner. Bravo! Thank you!
You really demystified this topic.
That's what it's all about, I feel - demystifying the topic.
I wanted to add: Great Video, don't you wish School was like that when you were growing up? Good teacher, good visuals, concepts in logical sequence. No Brats to disrupt your learning, and no Damned Test. UA-cam is Awesome.
William Pietschman - test-If you are changing oil in a Toyota Highlander on a Wednesday in a leap year would you use - 10W-30, SAE30, 0W-30 or 3 in 1?
One of the best explanations of oil on the internet. Thank you for creating this.
I think it's one of the best explanations on the Internet.
sir, believe me, I have searched about the depth of the topic so much and watched about 70s of videos around UA-cam. but you are the one who actually solved my doubts about how an engine oil gets thicker with the rise of temperature, it should get thinner with the rise of temperature,but actually it's not like that.. it actually acts like a thicker engine oil when the temperature rises. .. I'm very thankful to you sir.. I'm from India🇮🇳. From today I'm watching your video.
Thanks and welcome. 👍👍👍
i have not found a video in youtube that has a better discription an esplanation and breakdown that this video. all other videos are short quick tips that dont really mean all that much. But this video is so details and well structured. i now feel a lot more clued up and have a much better understanding and better grasp of what is happening and what to look out for in hte oil viscocity ranges. like i never new the viscocity range , ranges from 0 to 60 and no other video lists this. thank you for this well put tegother video
Thank you for your kind feedback. 👍👍👍
If I am a mechanic instructor, I would just play this video in class while marking paper. Very educational. Thanks
One of the best informative video I have ever seen. It helps me to overcome my confusion about engine oil grade.
Finally I understand what the numbers and the letter means. Thank you 👍
Fantastic rendetition!
Out of hundreds of people simply babbling along just trying to explain oil weights you sir have made it very clear and easy to understand to what id like to think for anyone.
Not only did you simplify and explain but you shed light on the deeper inner workings of the oil which is something ive always desired to know. Thank you sir very much.
Your way of explaining is simply brilliant
A first-rate, excellent explanation for the layman. Clear, useful and easy to follow diagrams. No jargon, no 'sell', no promotion of any particular product. Thporoughly recommedned.
Miller Milloy And incorrect
I think I am finally beginning to understand this mysterious process. Great explanation!
Thanks very much from Japan.
(That is to say one bloke in Japan and not the whole nation :) )
That is a top class video.
Appropriately simple and comprehensive in every part, nicely paced, nicely ordered, great graphics.
I'd give you an award for it... if I were able.
Now I know what it means that my bikes' manufacturers demand the use of such specific oils. In 1990 I was, very briefly, an apprentice mechanic at a Toyota dealer in the UK. I was not there long enough to learn this - bad relationship with the dealer manager.
I feel I have gone up one grade from, say, level 20/100 to level 21/100.
Thank you for your feedback. I really appreciate it. Craig
I viewed many videos on engine oil and now I finally understood how it work after seeing your video. Thank you very much.
If knowledge is power then the ability to teach it properly is also. You are very powerful. Thank you for empowering me with this knowledge.
Absolutely bloody outstanding - Thank you for a very clear and easy to understand explanation.
I'll put Mobil 1 esp 0W - 40 in everything
At least I now know why I'm paying more money !
This is an excellent presentation! Thank you for explaining how oil structure changes with heat, modifiers and solvent.
Great explanation, but something is wrong. The oil does not get thicker when hot. By simply looking at it when pouring it from the bottle to an engine it is thick. And when draining the same hot oil from the engine which was still hot at the time of draining at about 100C. You can clearly see it pour down like water and by touching it you feel that it is less viscous than colder oil. I think the multi grade allows for less thickening when oil is hot compared to a single grade, and oil is the thickest when cold and gets thicker the lower the temperature and thinner the hotter the temperature, the VM doesn’t allow it to thin as much as it would have without the VM, yet still its thinner when hot than when cold. Looking at oil spec sheets. You can see different viscosities at 100c and 40c.
Correct me if I’m wrong.
I understand your questioning of this, i really do, and you are right to question it, as many have. What I failed to do in this video is to better explain what I actually meant by this. In response, I have made another video, which I hope will help clear things up. You can find it here on you tube at: ua-cam.com/video/gmLASM9XcM4/v-deo.html
I hope this helps.
Thanks, Craig
Superb explanation, really appreciated. The only video I came across on UA-cam that explains oil behaviour in so much detail and so logically correct. Really appreciated.
The explanation of oil grade is very simple & everyone must understand very easily. Great learning for me. Thank you.
You are one of a kind teacher. Million Thanks for this Amazing video. I am studying IT networking but now I feel like studying motor mechanics :)))
5:50 that's why some older engines like my pickup truck have main bearing knocks on Startup and then after they get oil pressure they stop. It's also weird we live in a time where warm oil gets thicker and cold oil gets thinner completely opposite of what it should be great video man
Thank you so much for the nice feedback. I really appreciate it. Craig
Always wondered how an oil could become thicker when it gets hot. Great explanation.
one of the best on UA-cam
Matthew Trott, thank you for your positive feedback
100% agree
Excellent Analysis of Motor Oil and Easy to Understand Explanation. Thank You!
Thank you too. Craig
It was a really really great video for me. It explains all complex parameters very simply. Thanks alot
You are welcome! Than you also.
Great explanation, your a natural teacher !
sam oliver, thank you for your motivating comment. I really do appreciate it
Sam Oliver 🔥🔥🔥
so now i don't have any doubt regarding engine oils , thank u well explained
Thank you
Your have cleared all my doubts & answered all my questions I shall always remember this video
That's a really really great explanation, thank you very much for your effort. You need to teach students sir.
Thank you so much, after 41y i now finally know what and how oil is and works in the car! you should have a pay pal for donations!
Great Great video. Very informative. Thank you. Very well explained.
you might have gotten me my job at TOTAL thanks so much my man
Superb lesson, thank you so much! It all makes sense now. Reminded me when I was trying to visualize the lunar cycle in astronomy class. Get the right resources and be persistent !
Excellent job of explaining how it all works together. Maybe you could take one more step of how the different oils work themselves. The modern oils have changed a lot from the early days to cover different types of engines and requirements. Thank you.
Great explanation, my ignorance about oil grades removed. Thanks
Thank you Sir for this explanation. I genuinely belief that Fred Flintstone have it easy.
Thanks very much for this and the last video Craig, I imagine it will have taken a while to produce them and they will be of help to me and I imagine others for a very long time. Nice to find someone new I want to subscribe to as well
The more modern synthetics use a lot less VII's. They start with a synthetic base oil which thickens less so can meet the spec of a 5W and an SAE30. The only additions i'd make to the vid is that it's not that the oil thickens with heat, it's that it gets less thin that it would have done without the VII's, the cst of the oil still goes down, just not as much. Also these bearing are hydrodynamic so the oil pressure built up by restriction of flow from the pump isn't doing anything directly to keep the metal parts separated. In a hydrodynamic bearing, the supplied oil is sucked in and forced out by the rotation of the journal. The rotation of the journal creates an oil wedge that the journal rides on, like a surfer. The restriction of flow prevents too much side leakage from the bearing to guarantee oil wedge integrity and no metal to metal contact. The oil system is usually pretty much primed because the oil pump is holding the oil in oilways the block.
That was an excellent in-depth explanation.
Cheers😊
What great explantion! Thank you for your videos!
Thank you so much for the nice feedback. I really appreciate it. Craig
Excellent... today i got my concept cleared............Thanks Sir
Thanks Craig. Good explanation and I've learnt a couple things too.
You are awesome, after 20 years I finally understood it! Thanks mate!
Thanks so much for that excellent explanation as to how multi grade oils work. I’ve wondered for a long time how the additives modify the base oils.
Wow...Thank You. That was so informative. Great teaching style. Thank You, I finally understand what and why I'm buying.
Very informative, it was never explained like this before
Keep doing what your doing man, really informative.
Jonathan, thank you for the motivating feedback, I really do appreciate it
Thank you Sir ! I have learned a lot today.
It is an excellent tutorial,making me understood clearly.
The best explanation on oils ever!
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
Very informative and comprehensive....well done!!!!!!
Excellent simple explanation. Thank you.
A very good, clear explanation - I learnt a lot.
Please see if you can improve the audio quality.
fantastic explanation, I am about to do an interview to lubricant sales, thank you very much!!!
Mr Craig, you are amazing! Many thanks for sharing this importante information...i would like to have a Professor like you!
its so nice to hear you! many regards from Colombia, thanks!!
Very informative, this lecture is very beneficial. Appreciated a lot Sir. Keep it up.
Amazing explanation. It would be great if many of the other UA-camrs would learn from you.
great content and we learn something new from this video.
im pleased it was useful :D
-Craig
Wow that's an amazing explanation, now everything makes sense.
Amazing detail and very informative. Subscribed!
at last somebody has had the insight to explain carefully why oils get thicker when they get hotter when common sense dictates they should get thinner.....it's down to VM's and how solvents act on the bonds between them as temp rises making the bonds weaker so the VM's expand in size making the oil thicker.......great video
great now i'm confused ...VM= viscosity modifiers ?
steviezxr...sorry but you have not understood the video...if you're right then 5w-30 is wrong....5w = viscosity at 0 deg ....but 30= viscosity at high temps (100 deg) according to you at higher temp the viscosity gets thinner and should drop below 5 but it does not due to the action of viscosity modifiers and solvents...they are activated by heat making this oil thicker at high temp...remember modern oils are not single grade but multigrade
Awesome vid. That cleared up any misconceptions I had. Thanks.
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
great video. my guess than a 5w-40 would be ideal.
Very helpful. Love the molecular explaination as well.
Very good job on this educational post.
Outstanding presentation! Well done Sir!
a really clear explanation of oil grades.
learning is great I do know the older the vehicle is as well as the embien temperature comes to consideration thanks for sharing the knowledge.
that was a good explanation. learning initially that the oil is thick when cold and thin when hot... just when i was absorbing that idea , you gave a twist of " acts like 30 " after a minute of discrepancy , you introduced vm and solvent and again clarity came back... nice video.... hmmm but my sym scooter company manual recommended sae 10 w 30 and the mechanic recommended sae 20 w 30 ... i bought what the mechanic had recommended and he filled the tank... had i seen this video i would have gone for sae 10w 30... but may be sae 20w will act at higher temperature better than sae 10w..
m m ganesh Oil gets thinner with heat. End
Nicely and simply explained.
Thank you 🙂
Useful information make since .please keep pushing forward all the great information.thanks a lot.
Best explanation on UA-cam!
Such a good video. It deserves a subscribe
You explained this very well.
Very best video..now i know..thanks a lot in million times for this technical info
Thank you, thank you, thank you for sharing your knowledge. Liked and subscribed.
Good in depth explanation. Could you add a graph showing the temperature / viscosity relationship?
Excellent message. Thanks a lot for the great explanation provided technically
Hi Craig,
Thank you sharing the information in simple graphs and explanation with details.
Would you please help me understand following:
Mineral and Synthetic both oils are Multi grade right ?
If yes then What is the difference in these both the oils?
One difference I learned is uniformity (in terms of size) of Molecules.
Thank you in advance.
Learned a lot frm that bro thank you good video
I've been wondering about that since 1969.
This is really amazing video, thank you so much
Excellent explanation sir...I really thankful to you to clear my doubts...
Yes , Truly great explanation, ,simple to understand this comlicated chemistry
Wow did not know how all that worked. Can you do an explanation on synthetic and how it works in the motor differently than standard oil or conventional oil. Thanks
Well explained. Great work teacher. 100%
Very Good explanation....Thank you
You are welcome
Thank you sir for these full details. ...so...wide ranges of numbers could be better according to ur great explanation. ....as 5w-50 cover wider range of temps and better than 15w-40 as an example...isn't that? thanxs alot
Ali Hasan, yes absolutely. In my opinion the greater the gap between numbers will mean that the oil will adapt to suit the heat it is experiencing. When I say this, I am referring to the lower number only. The higher number ( e.g. 30) will have to be correct for the needs of the engine. I thought I had explained this but realised I hadn't and it was bought to my attention that I hadn't from the comment below (thank you for that). Anyway, the upper number (working temperature number) has to be correct for the engine as I've mentioned. If not, then as rightly explained below, the oil would either be too thick or too thin depending on the number. E.g. If an engine needs a 10W30, then a 10W50 would result in being too thick at working temperature. The issue really is only in the upper temp. I have known some users to use 0W30 for an engine requiring a 10W30. The range of numbers I was referring to, which should have been more clear about, was the lower numbers (cool running numbers). As the engine warms up the oil then will adapt to the heat of the engine up to the higher viscosity number and no higher. Apologies and I hope I've explained it better this time. Thank you.
"Better"? Not sure that's a god word to use. I wouldn't be putting a 5W-50 oil in a car that requires 5W-30. If 5w30 acts like a 30 (thick) at 100C, then a 5w50 will act like a 50 (thicker) at 100C, you could ruin your engine quicker, no?
LOVE the info and your accent!
Thanks for the explanation! You saved my day. Gracias
Glad it could help you :D Thank you for your kindness :)
-Craig
This my good man is a great explanation. Just got me to subscribe.
What’s a great tutorial!!!!!!! Love it
Nice explanation 💧🌱
hey repair specialist can you make a full break down on a 2 cycle carburetor like what all the holes inside and how it works
I think of the Viscosity Modifier like egg whites: Egg white when it is cold is thin and runny. Add heat to it, and it becomes thicker, actually until it is solid. And Of Course while you can't reverse that reaction, essentially Viscosity Modifier can, many many times. Since an egg white is a protein (albumen) it is a large chain just like a polymer. I suppose acids build up eventually in the crankcase, along with other Carbon Nasties, and eventually the solvent evaporates off. And then, this otherwise reversable process gets less and less efficient as the oil/VM/Solvent ages. The acid buildup No Doubt "kicks" more of the Viscosity Modifier into staying thick and not being able to "thin out" over time... Just as if your poured some vinegar into a bowl of egg whites... They "curdle" like that which I would guess gets worse over time. It's pretty amazing that it can go through this process so many kilometres and last as long as it does, really. Question: Do you think that it's better to let a cold engine come up to temperature before you exert a load on it? I always wait a few minutes before I actually pull away from my house, thinking that things are better lubricated, so less wear. Do you do this? My car's always last a long time, as I change the oil at regular manufacturer intervals, let the engine warm up, and am very gentle with acceleration. (And stops.) We always had to let the temp be "in the green" when flying. Aside from aircraft, Semi Trucks you call them lorries I think, have many gears, to better balance the load. But even an unloaded truck, Truck Driver takes a long time to accelerate up to working speed. So I try to do the same thing. What is your practice/advice?
73 DE W8LV BILL
This has been very helpful indeed, thank you