Almost reminicent of the old days when we would clean a thouroughly gunked up engine by draining the oil and filling with fuel oil. Then we'd run it 10 minutes or so and drain the fuel oil, dump the gunked up fuel oil in the tractor, refill the crankcase with cheap oil, run 10-15 minutes and change again.
But that was the old days, there are better (and probably safer) ways now. Just another post Fathers Day remembrance.
73 280 SEL 4.5