What causes gasoline in the oil?
by 
staticjones
ANSWERS: 2
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Without knowing what kind of car you are referring to, I can only give you my best guess. The only way for raw fuel to get into the oil is a leak in the diaphragm of a mechanical fuel pump. In modern cars with electric fuel pumps, there is no place on the engine where raw fuel can leak into the oil.
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I personally have done this in a 1989 Golf with an electric fuel pump that was overdue for an oil change. (There were other symptoms too but that's a separate issue. Suffice it to say, I now do an oil change as soon as I get a new car.) After the old oil broke down, there was nothing to keep the fuel/air from blowing past the worn rings into the crankcase. Fortunately for me the damage was minimal. Darryl - I go where the symptoms lead me. When I did an oil change (on the side of the road after it stalled in a large smoky cloud) the oil was watery and smelled strongly of gasoline. According to the dipstick there was considerably more 'oil' than there was the previous week; beyond normal variations in oil level. The car was better after an oil change but not great until after a can of ring restorer.
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