Anyone ever used this stuff? im wondering about it cuz carroll shelby endorses it but maybe its a gimic.

I used it in my focus in the gas and the oil. I really didnt notice any difference, but it says it soaks in the metal, so maybe it is helping the internals and I just don't know it. Didn't seem like it was worth the $40 IMO.

I take it this is an additive of some kind? I've never heard of it.

They advertise on Speed all the time. I don't see why not, although it depends on how many miles your car has on it.

Yea ive been laid off for a few weeks and i mostly watch speed channel and ol shelby says "every car he makes and owns has zmax in it. and if it didnt do something really great he wouldnt b standing here telling u this." so i wondered about it, i never even price checked it but yea im not payin $40......f that

even carol shelby can be bought for a price.

It's a friction modifier. Same as most oil additives are. More than likely it's something that is already used in oil, but in a higher concentration.

Scam IMO.

One thing I am curious about though it their warranty claims. You know that whole you use our product and if your engine blows we pay for a new one schpeel. Wonder if anyone actually takes them up on that? Because you know if it is the do all end all they wouldn't really need a warranty, would they?

I bought into the hype a few years ago on my 94 Ranger. It didn't hurt, but I don't really think it did anything other than make my wallet $40 lighter

Id rather buy a carbon fiber wallet

There was never a dollar that Carroll Shelby didn't like, and i'm sure Zmax gave him a few to endorse it.