I recently purchased a 2002 Audi s4 2.7 twin turbo. I'm wondering which oil is going to be the best for me. Mobil 1 and gc both me specs for vw 502, and I've heard so many good thing about rotella t6 5w-40 that in considering it as well. I'm wondering which is best with everyone's experiences in turbo applications. My car is stock. I know the rotella is a tad thicker at cold start but will here really be a difference between 0w and 5w and will it hurt at all? I need opinions please! I've searched a lot about every oil for this car and of course you have people who say one or the other but then you have people that say don't use each of these as well. All of these I have found locally on the shelf so that's not an issue. I don't have a warranty so I don't NEED vw 502 spec. But I figure if they approve its worth trying to get something within spec.