In my OS140 i changed the bearing to the EFI bearing. I never use afterrun oil. I don't ru it dry at the end of the day I just clean the plane drain the tank and that's that. When putting the plane to sleep for the winter I run the engine dry it's the only time. I run the ES s8 pipe and a 18.1x10.1 APC or a 17x12 APC. And also the 3M mintor dual plug head 65 bucks from Aeroslave
Excellent motor.