Fuel in Engine Oil

[away572]

Thanks for the reply, no, it's definitely not water. Everything was in place and secure, aircraft was hangared out of the weather. There was a definite aroma of avgas emanating from the "bucket 'o oil" and the oil was not milky, just thinned out. I've heard two theories....1) fuel pump needs to be rebuilt, or 2) the mixture cutoff was bumped back open while exiting the aircraft. Head pressure from the tank then allowed fuel to run into engine (the aircraft sat static for 3 weeks). Didn't know if anyone else heard of these things happening?

[Flyer770]

Does your aircraft have an oil dilution system? That will put a gas in your oil and a leaky dilution valve could do it.