Well I was one corvetteforum.com recently and in the C5 tech section there was a big thread on Mobil 1. I forget who said it but one guy said that after they lost the court case to Castrol they changed their formula back to the 1995 one (not 100% synthetic) and slapped a new label on it. They also suggested Redline and Amsoil for the best oils out there. Someone uses 0w40, thats some oil there. Just food for thought here..
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Mobil 1.. true synthetic?
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