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vw and other german engines designed for thicker oil. late japanese motors got much tighter gaps between parts and require thinner oil.
you sure can use 5-30 oil on 2.5.
but as far as I know 0-20 is GF-4 certified and 5-30 is not.
besides, dual VVT-I needs certain thickness to operate properly and 5-30 is out of that range.
I've seen oil analyzes and long term test results of 0-20 toyota oil and 0-20 mobil 1. they both good up to 20K miles, but right around 12-13K level of additives drops to to the point were engine parts wear starts.
at around 70-80K if engine will start consume some oil I might switch to 0-30, but new engine should run more efficient on 0-20.
Last edited by molson.david; 11-13-2011 at 07:30 PM.