I have recently switched both my cars( 3.0L turbos) to the ESP 5/30 from PP ultra 5/30. I'm an auto tech by trade and was not happy with all the deposits in the PCV/oil traps of both these engines, even when changing oil at 8k klm .Both get run hard, but still....I originally went with PP as it was a5/b5 . UOA was decent but not happy. Seems this M1 is quite a good oil from research on here ,so will see how it goes.