Re: Prolong..anybody tried it?
I went to their site and found it interestingly short on information. They tell you what it's not, but don't tell you what it is. You can get great results (reduced friction thus reduced heat, improved mileage etc etc.) by using a chlorine derivative, but you also destroy your engine in the long run. Some friction reducing chemicals actually etch into and corrode the metals in your engine: why Slick 50, STP and a few others were sued by the FTC.
Then there's the matter of spending an additional $21.95 per oil change. Why not just buy a great quality synthetic lube, be sure of what you're getting, and be happy?