It depends on how dirty the oil is, and how clean you can get it. I wouldn't do it if you are just running it through a typical oil or fuel filter but some people do that and have got away with it. I would want to have an efficient centrifuge setup to filter the oil with but they are expensive too. A good centrifuge setup can make dirty oil pretty clean or at least look like a gold colored tea after a good pass or two. You can still have the concern of chemicals or acids in the waste oil and oil can coke up the combustion chambers, injector nozzles and pistons too.
I've ran up to 100% oil/atf before, or at least as close to 100% as I could without draining the fuel tank and lines. When you start getting over 50% you need to consider the outside temps, cold, thick oil doesn't move very well through fuel pumps and IP's.
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Today's Featured Article - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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