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ULSD is the only legal highway-use diesel fuel - you cannot legally use waste oil, crude oil, kerosene, jet fuel, or off-road diesel, mixed or otherwise.

As for mixing crude oil with diesel fuel, there's a reason it's crude - it's unfiltered, unstrained, and unprocessed. First, you'll clog the oil filters, and there's a good chance you'll do the same with the oil lines, as well. From there, it depends on if you have a high or low pressure oil delivery system - well, how fast your vehicle gets shut down is dependent on it, rather.. the effect is more the same. Somehow, if you manage to get around the oil filter issue, the particulate matter clogging up and grinding inside the engine, plugging the injectors, etc., then you're still SOL if you have an EPA-2010 (or Euro 5/6) compliant engine with an aftertreatment system, because you'll plug the dosing injector and probably have to replace it, you'll plug the Diesel Oxidation Catalyst face, and you'll plug the Diesel Particulate Filter - plug them bad enough, you'll be replacing those, as well.

Just use the fuel you're supposed to use.

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Q: Is it legal to mix on road diesel with crude diesel and how will it affect the engine?
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