ive beeen using lucas for about 6 months now, in my 95 neon. car runs TERRIFIC with it! it lubes the upper cylinders, and maintains cleanliness. i remember reading and article here, some guy claimed it was cleaning the carbon deposits off his piston tops! he removed his valve cover, assembly, to verify. i wouldnt use thier oil treatments though, nothin should be mixed with oil other than auto rx or LC 20. PF 60 is very interesting stuff too, but dosnt seem to lube as well as lucas. Lucas gas treatment is VERY good stuff! but use only as directed, once i put an oz. or 2 too much, and my pistons were revving faster than the car moved, lol. anther tank of gas flushed it out.