Engine oil has in the action in engine: Lubricant, sealed, cooling, damping, antirust wait for action. Engine oil viscosity is different, should say to have certain effect to above action.
Viscosity is tall attrition power is great, this really differ calm; See attrition cooperate precision and exterior treatment precision deputily even.
So, when we pick engine oil, do not want self-righteous, must pick engine oil according to the requirement of manufacturer.
For instance, feng Tian's engine, the product manufacturer that produces previously asks to use the engine oil of 5W40, the product that produces now asks to use the engine oil of 0W20.
Why the engine oil that can abundant cropland engine use the 0W20 with lower viscosity now?
The exterior treatment precision that should be Feng Tian has rise, attrition deputy fits tolerance is smaller, wear-resisting is decreased grind a technology to have progress, oily film ply can be reduced, reduce attrition loss, reduce oily cost, return the service life that can assure engine.
For instance between cylinder bushing and piston annulus sealed, manufacturer asks to use the engine oil of 5W40, because manufacturer has checked to use this viscosity social estate, loss of the sealing of the air cylinder of engine, attrition, damping can achieve best status;
If reduce viscosity, attrition loss falls a bit, the sealing of cylinder meets the likelihood become poor, integrated effect is not ideal;
If viscosity increases, cylinder sealing is a bit better, but attrition loss increases, final result is not ideal also.
So, the choice of engine oil should match with the demand bearing of engine.
