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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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