will_gurt
Charter Member
- Joined
- Nov 30, 2003
- Messages
- 163
- Location
- southwestern ,PA
- Occupation
- operator in extended holding pattern
This is really going to sound stupid, but here goes. What does the API rating in oil mean? I was looking for API class SE or SF. The closest I could find is SG. What are the differences? Would putting the wrong API index oil in hurt the engine?