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 Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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