Anybody have any experience or thoughts on it? I am always very warry of any of these additives and their claims, but I must admit when I put duralube in my wife's DeVille, I noticed an incredible increase in the smootness of start up. From all the informercials I have seen on Speedvision Zmax seems the most credible. So, my questions are, does it do what it claims, and is it necessary? I would also be interested in hearing about their tranny fluid additive.


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Jason Priest
1986 420SEL

Heed the old adage: "If it's too good to be true, then it's probably not true."

I remember watching a very seemingly convincing ProLong infomercial years ago, but I wouldn't put that sludge in my beloved 300D if you held a gun to my head. Now, if an INDEPENDENT lab confirmed that the stuff might have some protective value, I would reconsider.

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Matt
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Grey/black '84 300D, 194K