The sad thing is, I know guys thinking they are doing the right thing by tossing brake fluid (glycol based as well), 1-1-1 trichloroethane, gasoline and other hydrocarbon solvents in there (okay 1-1-1 is polar), but as others have said, it is re-refined. Sure there might be some old redline in there, but there is also ATF, tractor hydro fluids, gear lube and possibly an assortment of zero add pack oils too, but the end result is a good oil.