Tho I don't have too many miles on it, all's well so far. The higher viscosity may be an issue for the PS injectors, I think they have small holes. There's also a possibility that the carbon in used oil may increase friction and accelerate wear of the injection system-that would apply to any type system. It seems to burn pretty cleanly, even on a smog test machine.

 

I have been lead to bielieve running through a centrifuge will remove the nasties and if one chooses a .5 micron filter can be added to the trucks system.

 

I ended up running my truck on 50% diesel (or sometimes kerosene) and 50% waste motor oil, transmission fluid, and or hydraulic oil for a couple of years. I let it settle and ran it through two fuel water separators, then through a one micron commercial sock filter. It smoked some around town, but was fine on the road. It didn't seem to hurt a thing truck always ran good. I sold the truck last year because I got tired of fixing little nick nack problems, but the engine ran great with plenty of power.

Funny thing was a friend had an old diesel Isuzu Pup and it did not like that mixture at all. Never did run good on it.