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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
VR-1 Racing Synthetic in 5w50 is what I would use. Good stuff. Practically the same as its predecessor, Valvoline Synpower 5w50. To be honest, I don't think there's much between that and Castrol RS 10w60.
I think you will find that the 20w50 is Mineral Oil. I have only used the 5w50 and rate it very highly. I would think that the 10w60 is just as good, as long as its synthetic.