I've not really looked at my manual in a while, but a discussion w/ a fellow BitOGer made me look if Audi had called for any relavent specs beyond API. There were none, but it was wierd to see SF or SG as the recommended grade. It's a complex 30v non-turbo engine that someone here (guess who) suggested only synth w/ VW 502 spec. Wow, can I really run my car on this and save $.50c a quart? That comes out to $3 less money wasted per change! 7500 mile intervals and API SF, how can I go wrong? No wonder 1.8t guys have sludge!!!