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DAP video shows rather noticeable deposits on 2015+ cars, "these cars do not generally have carbon build-up issues". Humble Mechanic video shows light build overall and thick rings at the edges of valve movement on a 2019, "that's more then I would have expected after 10000 miles" and he goes on...

Thanks. However, it seems that the "could use 504" line in the manual would imply that the manual assumed something "better" on the sticker, i.e. 508 in the evo4 case. (Using 504 instead of 504 was a joke, not a typo.) Perhaps they just didn't bother pushing for 508 for gas mileage due to the...

(Owned multiple ea888 Passats until 2 years ago, rarely used 504, usually used 502 (M1 0w40) since low-sulphur gas status was iffy.) Just purchased a leftover 23 Arteon (in the US). I rather wondered what the oil situation would be; happy that gas appears OK these days to use 504 without...