https://www.audiforums.com/forum/members/esandes-36163-albums-esandes-album-3837/

this is 42,000 km with mobil 1 ow-40 and the original 8000 km with factory fill castrol syntec 5w-40. looks like new. there's no wear noticible other than the 1 micron film of "anti friction" black coating. the dealer told me they only had 4 cam follower failures. with this kind of evidence, i would think 4 would be too many.

also in the album are pictures of the OEM diverter valve i had replaced with the rev D.