Surveys on several VW forums have Castrol 20w50 a clear winner for quality, price and availability, but other good brands like Valvoline, BP, Shell etc get honourable mentions too.
If you run it HARD than a 20/50 oil is good. I run castrol non synthetic, but I'm thinking of switching to Royal Purple. Still want to get more opinions before I do the change over but I heard good things about that brand.
My oil changes have been all at the dealer, at 15,000KM (about 9300 miles) intervals, Castrol Syntec.
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