Quote:
Originally Posted by BHarvey
10w30's are usually middle of the road in the 30 grade, 5w30's are on the lighter end, for the most part. Most 'dino' 5w30's that start on the light side of 30 will shear to the 20 grade in less than 2k miles on 'severe service' oil change intervals.
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Since you bring this up have you ever tested 0w30 synthetic?
My Cobalt calls for 5w30 but also can accept 10w30, 10w30 definately reduces winter FE. I have considered the 0w30 weight but worry about it not being enough.
Any ideas?