hi friend I have a hummer h1 2004 k series. the company recommends 15w40. However, I believe that 15w40 oil is cheaper and less refined than 5w30 or 10w40. Isn't synthetic 5w30 oil better than and more protective than 15w40? I would like to have clarification on this matter. Thank you
You should let the glow plugs warm up before starting the engine.
hi friend I have a hummer h1 2004 k series. the company recommends 15w40. However, I believe that 15w40 oil is cheaper and less refined than 5w30 or 10w40. Isn't synthetic 5w30 oil better than and more protective than 15w40? I would like to have clarification on this matter. Thank you
Let me know if he wants to sell it