My interest in these stems from the age and mileage on my 1992 Legacy L AWD in MT with over 250,000 miles. These products claim to make the engine run smoother and last longer. I basically want to know how well they work and if you would recommend them. Now I must confess that I know little about automobiles at this point, but I do understand that these will in no way be a cure-all, I merely am looking for some mild protection and perhaps restoration to my vehicle.
Alright, so, this zMax stuff I've seen on an infomercial a while ago, and after sixty minutes of it, well, I'm thinking about it. A fuel additive, an oil additive, and a transmission fluid additive. At $40, I don't mind. What do you think?
The other brand in question sells an oil additive Hy-Per Lube, and a fuel additive Hy-Per Fuel. The company sells these two together in a 'starter pack' for only $14. After seeing this I'm beginning to think zMax is pushing their luck--
--but is it really the same? Again, I know so little.... Hell, I'd even use them together if you guys gave me to okay, anything to keep this car alive. Maybe one day I'll be able to give it to my kids.

Well, what do you think?