I just received my oil analysis for a 10,000 mile use of Petro Canada 5W40 oil in my 240D. The good news is that the it appears to be perfectly OK to run 10 thousand miles on synthetic oil even though the soot was 4.5%. The oil looked very black but the wear metals indicate that everything was wearing at a very low rate. It only had 33 parts per million iron and 1 PPM of chrome. This car has a spinner bypass filter so maybe it doesn’t apply to everyone’s car.
This is the first car that I have ever owned that would go 10,000 miles with no oil added.
At 230,000 miles I think it is amazing.