For anyone interested, Mobil 1 now has 0w40 ............. which meets VW/Audi 502 & 505 specs. I've been using 5w40 Pentosynth for quite a few years now, year round .......... in non-turbo, 20v turbo, and later model V6's with excellent results. Steve H '88 5ks Avant '90 100 sedan '91 200 20v TQ sedan '97 A6 Q Avant