Fuel in Engine Oil

[Flyer770]

Preheating is preferred for cold weather over oil dilution so many planes have had the system removed. At the oil pump there's an inlet for the fuel, tracing backwards there's a solenoid valve which is energized and allows fuel to flow to the oil system. The solenoid gets its fuel at the strainer for early Skymasters. There's not much more detail in the Cessna maintenance manual and I don't have my engine MM with me at the moment.

[skymstr02]

Another possibility is the engine driven fuel pump seal is leaking allowing fuel to enter the engine from there. I've seen that happen before.
When's the last time that the fuel pump was overhauled?
Was your fuel consumption higher than normal, this wont show up on the fuel flow gauge, but the tanks would've taken more gas to fill up.

Drain all of the oil and replenish, fly local for 1/2 to one hour and check your dipstick again for the smell and the viscosity.

Dave