Performing moderate engine de-acceleration, or engine braking from 4000/rpm should be done as it applies a different pressure on the piston ring. This WILL NOT suck oil into the combustion chamber, I don't care who say's it will, it won't.
This is every engine builder's suggestion. BMW is not going to write a 30 page report for every retard that has the money to purchase one. So instead they write a concise, easy for the average "schmuck" suggestion on engine break-in.
Any one who argues this simple and logical explanation is just retarded. This is engine 101 guys.....
