Yes, I bought one of those add at anytime bottles of Rislone and I put it in my car, in my oilpan full of GC. Shut up, I don't care what you think. Yes, I know the VOA shows next to nothing, but I now believe that there is more than meets the eye when it comes to a UOA/VOA. I am changing my oil on Monday. I'm in a bad mood.