I drain used motor oil into a spotless oil pan, then directly pour this into the fuel tank of my Cummins. The oil has already been filtered thousands of times by the oil filter, and it gets filtered down to 10 microns by my fuel filter before entering my fuel injection system.
I've heard it is great for lubrication, and I have observed the best mileage running waste oil in my rig.
To be sure, the doors will fall off the POS Dodge before the motor gives up.
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