Do not knowingly operate with heavy fuel load in the
oil, besides the lubrication issues already spoken of, should the fuel or fuel vapors ignite it will absolutely blow the pan and valve covers off, I have seen and heard it happen. Tech in our shop was attempting to correct the tune on a two year old poorly cared for car (infrequent
oil changes) as he was adjusting the carb (at the time) BANG!! the noise cleared the showroom floor as we all went to see what happened. It was as loud as a magnum load shotgun. The force lifted the valve covers and popped the pan (tore the metal near the attaching bolts for both). Rang the guys bell real well.
Be careful
Rick