I've been burning my waste engine oil for years. All my waste oil either goes into my diesel tank - or into my chain-saws for bar oil. I doubt I've ever had more than a 10% mix, but I don't keep close track. It used to be standard procedure at big truck stops to put all waste oil into the diesel fuel. In fact, if you read some of the owner's manuals from the late 1970s - for GM diesel pickup trucks - they warn NOT to buy diesel from truck stops because of the waste engine oil added to it.
In regard to having trouble with particles not filtered out? Someone will have to explain the myth to me. I dump waste engine oil in my 500 gallon diesel tank. This oil has already been filtered by the engine oil filter where it came from. Then, when I pump it out of my bulk tank, it goes through another filter (microns of my choosing). Then, when it goes in my truck - it gets sucked through a fine screen in the fuel tank, and then goes through two more diesel filters. I've never had a pump problem, nor have I had any problems with plugging filters.
Keep in mind that one gallon of waste engine oil thrown into a 500 diesel tank is all it takes to make all the fuel turn a dark color. If your tank gets dipped and checked - I suppose it will lead to some questions. But, it IS legal.
The reason why big rigs used it - but GM warned against it - is this. Big trucks just about always have heavy-duty in-line injection pumps. Light duty rigs - e.g. pickup trucks and cars just about always have light-duty rotary pumps. The only exceptions that come to mind are a few Mercedes diesels in cars, and certain years of Cummins diesels in pickup trucks. E.g., a 1992 Dodge Cummins has a rotary pump, but a 1993 has the HD inline pump.
That all said, I run diesel mixed with waste oil in my 81 Chevy Chevette, 91 Volks Jettas, and 85 Isuzu 4WD pickup - all have Bosch rotaries and all have been fine.
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