I've had my 4-door Cutlass Supreme since I bought it new in June 87'. Since using Lucas Oil Stabilizer and Lucas Transmission Fix. It purrs like a kitten. It had two oily parkplugs and no power. all plugs are a nice tan brown and at 60 miles per hour i've got thrust that wasn't there before. and it's not burning oil like it was a year ago. It also passed the Emission test for the first time in 4 years. Transmissionshifting is so much smoother as well. compression has improved dramatically. no one would believe how a car 18 years old with 240,000 kilometers could run so well. thanks to Lucas Oil Stabilizer.