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Letting the engine run down while fuel is in the cylender and washing the oil off the rings then restarting is like doing a bunch of cold starts. Pretty much why fuel starvation is the only way to go for cut off. Keep the spark popping to burn out and use the energy of the fuel after cut off, (still some fuel in the intake on a fuel injected engine) Then you wont have the problem of fuel washing the oil.
The operators manual for my Cessna gives a table for oil dilution for cold starts. Nowadays most people use preheat though.
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