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Originally Posted by davidyan
Use a 5w30 for normal and even moderately spirited driving. The thicker oil weight is probably only good for all-day track racing and would be too thick for the close clearance engine. Either of the brands would be ok but Redline has the highest group rating and contains Ester as recommended by the owners manual if that's something you're interested in.
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So does Amsoil - here is a snippet from a paper on group ratings that has been quoted a number of times in this forum (emphasis added):
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The oils that are commonly mentioned are Group II and Group III synthetics with the exception of Royal Purple, which is a Group V. AMSOIL is a Group IV synthetic (PAO) but also uses Group V Ester technology. It gives you the best of Group IV and Group V synthetics. Mobil 1 is a Group III synthetic. AMSOIL is a Group IV synthetic.
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