QUOTE(jersey914 @ Oct 24 2012, 05:37 PM)
Is 20W50 the recommended viscosity by Porsche and VW?
No sure but you have to realize that oils have come a long way since our cars rolled off the line and may be quite different, hopefully better, than what they filled it with at the factory and recommended in the owners manual. If I recall, Castrol was recommended in the owners manual.