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we ran used motor oil in lots of diesels, as well as ATF. The only real problems we had were with the electronic chevy 6.5's. Someone told me they have optical sensors in the injector pumps which must "see" through the fuel for timing.
With motor oil it can't see through because it is too black.
We cut atf with 8 to 10 percent gasoline and it runs just like diesel. Used motor oil filtered to 3 microns we'd cut with up to 15 percent gasoline.
When it gets really cold, and you are using the dodges, they don't like to start on pure oil - you have to run 1/3 diesel.
The ford 7.3's burn anything.
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