On one of the videos of cold starting an engine it was shown how, when cold, unburned gas can get past the piston rings and mix with the oil. The video also showed two oil samples, one clean and one mixed with gas from cold engine starts with short runs, engine never fully warmed up.
Even with a long engine run where the engine gets up to operation temperature for +15 minutes does the mixed gas really ever "burn" out? Obviously the gas doesn't catch on fire and burn but then how else is it removed from the oil at temps of about 200F? I can see how water will boil off at these temps but what gets rid of the gas? Does it just boil off like water? Will the nasty ethanol be removed as well?
Even with a long engine run where the engine gets up to operation temperature for +15 minutes does the mixed gas really ever "burn" out? Obviously the gas doesn't catch on fire and burn but then how else is it removed from the oil at temps of about 200F? I can see how water will boil off at these temps but what gets rid of the gas? Does it just boil off like water? Will the nasty ethanol be removed as well?