I thought this to be an amazing product and was taken in by the advertising and infomercials, not to mention people like Carroll Shelby endorsing it. I went and bought this stuff for $40 and poured all 3 bottles of it into my Transmission, Engine and Fuel tank. Then after driving for a few days, I didn't really notice anything substantial on my 1999 150,000 mile Chevy Cavalier. I thought I would look at the ZMax web site to read about what I'm supposed to be noticing. The only thing I noticed was the FTC lawsuit against the company that makes ZMax. I researched it and it concludes among other things, that the CRC L-38 test shows more than twice the bearing wear with ZMax added than with straight motor oil. That's bad. I will be draining this corrosive liquid out of my car at the crack of dawn. You can read about this at: www.1st-in-synthetics.com/zmax.htm They also have interesting advise about any oil additive including Dura-Lube and Slick 50 who have also been sued for similar false claims.
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