Royal purp worth it?
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02-20-2013, 05:13 PM
2011 Subaru/2002 Audi TT Quattro
Their 10w-40/HPS would probably work fine and has a stout additive chemistry. From the used oil analyses I've seen, the regular RP 5w-30 will shear down significantly in a turbo. So I would not use that grade.
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