No, I was referring to the oil (Marvel Mystery Oil and/or two stroke oil) that I mix with the gas.
Howver, it's possible that some fuel my also make it, especially if running very rich. However, I doubt it will remain in the oil. Much more likely it will evaporate when the oil is hot. Fuel is rather volatile.

Finn

Bob Perkinson wrote:

 

 

a portion of the fuel/air mixture is pushed into the crankcase (for lack of a better term).

 

Finn made a statement a few weeks back that he had to drain oil from his sump because of the fuel that had gotten past the side seals.  And he’s flying.

 

Bob Perkinson