Quote:
Originally Posted by ezaircon4jc
The 0W is only a 0 weight when the oil is cold (W after all stands for winter). As it warms up it "morphs" into whatever the higher number is. In SoCal we can run a straight 30 weight (no "Winter" weight needed) with no issues.
I always use what the manufacturer recommends as they have lots of people with lots of letters after their names to make sure the oil formulation is correct for the longevity of the engine. MOST manufacturers these days design at least a 150K engine life. Obviously good care and proper fluid changes will increase that.
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0w oil is a physically thinner oil then 5w, meaning it cannot physically "morph" into a thicker oil which is not. thick oil protects your rod bearings at operating temperature and especially during high abuse.