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Most of the oil I collect is from a friend who owns a bus service faclity and another friend with auto service business at his house. the oil from the bus service is mostly from the bussed he service (15w-40) the shell brand.
I use to filter the oil down to 1 micron with filter bags, it seats for several day before I mix it with Regulan Unleaded Gas (RUG), after mixing it I let seat for several more days before it is pumped into the truck. The initial ration was 85% wmo and 15% RUG, got alittle black smoke. I am mixing it 80% to 20% now, at this ratio the smoke (gray) is minimal only when WOT. The water injection and HOD onboard plays a major role in the clean burning, the tail pipe does not look black, it is more gray and no black powder.
That's a photo of the tail pipe on my Ram, as you can see it is gray and no black powder. This truck has a tuner onboard, set at high ouput 150+ hp which is dumping a lot of fuel. Trucks with the same set up, their pipe is black and lots of the powder junk not to mention their fender and bumper are black as well.
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