Best oil on sale???
#5
I would stick with an oil that meets the GM-4718 oil spec for corvette engines. Pennzoil Platinum, regular Mobil1, and Castrol Edge all meet the spec. - Castrol Syntec does not. I personally would go with Edge 1st choice - Platinum 2nd choice - both excellent oils.
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Ive always run German Castrol in my SS. I wouldn't run Royal Purple in my lawn mower never mind a vette. Search around for some UOA's and you'll see what i mean. To the OP all three of the oil's on sale would perform well.