It might always be 95 degrees outside, but it isn't always 95 degrees inside your engine. Multi-viscosity oil does not thin out as much as engine temp rises, so it protects better when the engine warms up while still not putting a strain on your starter when the engine is cold. Bill ----- Original Message ----- From: "John Brush" <jbrush@AROS.NET> > > The differences between mult-weight and straight weight oil eludes me. > > If it is always 95 degrees, what is the difference in viscosity and > protection between 20-50W and straight 50W? Does not the use of > mult-weight simply mean a thinner oil in cooler temps, and the thicker > rating when it is hotter? |
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