Quote:
Originally Posted by Werner
Good evening!
These motors are unsuitable for low viscosity oils. The large installation tolerances require a thick liquid oil to maintain a hydrodynamic lubricating film in the crankshaft bearings.
In addition, a low-viscosity oil leads to increased oil consumption and the combustion residues in the combustion chamber got too much.
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My understanding of multi viscosity oil.
10W40 - has the viscosity of a straight 40 weight oil at higher/operating temperatures. Straight 40 weight oil when at low temps is much thicker viscosity, so does not flow/lubricate well.
Multi viscosity oil changes so it has the viscosity of a straight 10 weight oil at very cold temperatures, it is not the viscosity of a 10 weight oil at high temperatures which would be very thin.
So a 10w40 oil attempts to keep the same viscosity for both temperature extremes.