quote:I'm not completely convinced that this is exclusively due to the group III thing. I've seen sludge/varnish with M-1 5-30 use too. Meanwhile, Mori has shown pics of his Audi's spotless engine using Syntec 5-50 with 10k OCI's.
Originally posted by Cary: Someone commented that a good PAO oil would not have sludged up like that. The US BMW labled Synthetic oil is a group III hydrocracked oil, not a PAO.