I think that we generally agree that lots of idling, especially in cold weather, loads the oil up with fuel. What happens to that fuel? Is gasoline fully miscible? Are there reactions between the two fluids that cause precipitates or emulsification? If the oil heats up to operating temperature, will all of the fuel evaporate and exit the crankcase as blowby or otherwise? Is there permanent degradation of the oil, or will it recover its viscosity and FM/AW properties? Are there other questions that I have negelected to conceive that you would care to answer?