Quote:
Originally Posted by Lion_HUN
Maybe it depends on which climate we are living in.
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That is the #1 deciding factor, try running some thick as molasses oil in -32F....instant seize!
The fact of the matter is the oil, regardless of weight, should operate within a certain spec at *normal* engine temperatures, within a particular age & build of the engine...
worn out bearings means more of a gap to put oil in, so thicker would be nice-ish, very very tight tolerances on newer engines can make better use of the thinner oils.
Colder climates need oils that can get to their proper viscosity at normal engine temps quicker, proper viscosity here being up to spec to the particular engine (worn, new, tight spec tolerances, break-in and so forth) etc.