BT125T 2 Episode 5, new inlet manifold new fuel filters replace engine oil

BT125T-2 Episode 5, new inlet manifold, Tong Bu,
Clean Drain pipe
tank level sensor and new fuel filter in series. Remove foot panel.
check size of valve studs, 54mm or 57mm studs. Turns out they are 54mm.,
And replace engine oil 10W-30 Biltema motor oil (mineral).
PCV outlet, Positive Crankcase Ventilation
Replace oil drain plug to a stainless steel magnet one. M12x1.5 thread.