has anyone changed to synthetic oil in the engine before 12000 miles
I can't speak to the aircraft cylinder walls, but as far as the reference to 'Bimmers' goes, the cars have different liners that the motorcycles.beartooth said:Went to synthetic at 7K in May this year. Just returned from 2200 miles to and from the MOA in WI and didn't use any oil that I can detect. They are factory filling cages these days with synthetic oils, including Bimmers. I think we need to put to rest the myth of dino oils and engine break-in. The only recommendations for special break-in oils seem to be in the aircraft industry. Must be something unique about the metals involved in cylinders and piston rings. I do know that aircraft cylinder walls are tapered (like a choke on a shotgun) and expand to parallel when fully warmed up. I yield to someone with more knowledge who can explain the differences.
Bruce '05 LT