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I dump used motor oil from a car change directly into the fuel tank. I figure it's been filtered thousands of times, and then once more through a 10 micron fuel filter before it gets to my injectors. Of course, this is just 1 gallon of oil in a 35 gallon tank, and it's twice per year.
I've heard not to use power steering fluid, but I don't know why. I've also heard transmission fluid works, but will loosen up any crud in your fuel system and plug your fuel filter in a hurry.
I'd probably run any of these mixed with diesel in my truck. Anyone know how tiny I should be filtering to?
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