I put some of that STP stuff in my car when my fuel pump was making noises, The stuff seemed to quiet the fuel pump, so I started putting one in every time I stopped for gas on a long trip, cause I was worried about my pump dying. I ended up with about 1/4 of a tank of unusable gas that just stayed at the bottom, and when my fuel level got to 1/4 of a tank the car died. I emptied out the stuff from the tank with a siphon pump and it didn't even smell like gas anymore. I don't think the pump was sucking all the stuff through to the engine. I never would use that trash in any car ever again, I think it can do nothing but harm, maybe it could clean the injectors out if you dip them in a bottle of the stuff, but I would never put it through the fuel system. Joe P. VIN 17167 6808