Hi, I'm sure you fellow Audi 1.8 T owner got that packet from AOA stating it will extend oil sludge related repairs to 8 years from date of delivery regardless of mileage. It even discusses VW approved oil at length and provided a list of Audi approved oils. I was quite concered GC 0w-30 isn't on the list Among others, Castrol Syntec 5w-40 and M1 0w-40 are on it. **** , I just changed my oil yesterday with some GC. Am I going to get crap from AOA if I need their help down the road? They can easily tell me, sorry we can't honor your claim you used an unapproved oil. Should I switch over to a 5w-40 or M1 0w-40 permanently. What are you fellow 1.8T owners doing? Thanks!