Used it in my stang gt. The problem with these things is, you don't know if it works, until, well, it doesn't (i.e. the engine seizes). My experience wasn't good. For some reason, the rear main seal started leaking the next day, I pretty much ignored it, oil leaked on my clutch, and so I had to do a clutch job /rear main seal 6months later. I wouldn't use it again, until an objective source (consumer reports or something) reviews it.
I wouldn't recommend it based on a couple of things: 1) Oil manufacturers say not to use additives and 2) I think that Slick 50 was charged by the FTC (Federal Trade Commission) for making false advertizing claims. I think this slick 50 is bogus, I've read the additive is a chlorinated compound that could damage certain engine components. At the very least it will upset the oil chemistry. I would recommend using a good quality oil.
I also have one on Prolong and one for Duralub, I think after reading these over I am of the opinion that oil additives are not much more than snake oil. Please don't that my word on it read over the FTC web pages, you'll find some very interesting information there.
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