Quote:
Originally Posted by h018871
The Royal Purple is Dexos 1, not certified as Dexos 2
there is a small 1 or 2 in the square symbol
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No 5w30 is certified as dexos2. Just dexos1 but must be full synthetic. Still the best choice for street cars imo. Heck, i tracked my modded c5z on 5w30 for over a decade with zero issues. Mind ya, a different motor. Anyway, 5w30 used to be a c7 and gen6 factory fill for years, so nothing wrong with it and much cheaper too. Just not authorized for track. Cheers!