Well, since my RS5 is 1 1/2 years into the 4-yr/50k mile warranty, I don't want to deviate from the VW 504 spec for on the 2.9L TT V6. As my SQ5 is 6 months from the 4-yr/50k mile warranty expiring, I decided to deviate from the VW 508 (0W20) spec and go with the VW 504 (0W30) instead. Overall, the 0W30 in the 3.0T TFSI V6 in my SQ5 is contributing to a quieter-running engine.