Thanks for all your input everybody. I've got 2k left before my next OCI and I'll let you know what I use. Also, look for a UOA around that time because I'll be putting one up to see how the M1 0w40 held up in my engine. I haven't found many UOA's for the Audi 1.8t's although I did find one where someone had ran it in a VW 1.8. Are there any major differences between the VW and Audi 1.8t's?