Click here to enlarge Originally Posted by SilentShout Click here to enlarge
myself and a few others have found that vpower is quite sooty, my old s15 loved the stuff, i didnt as cleaning the black off the back bumper on a white car was a weekly chore Click here to enlarge .
Black soot; rather out than in, that shows that the fuel cleaned the engine Click here to enlarge

what sort of engine oil did you use? not too thin I hope.