Quote:
Originally Posted by Glina
10w60= slow
5w30= :-)
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In the simplest term, yes.
The engine is going to waste energy pushing through the thicker 60 weight oil, so it will make less than those engines using 30 weight.
Also on cold starts, the 10w weight oil is going to circulate slower than the lighter 5w weight oil so there will be more wear and tear for the initial few seconds after cold start.