Originally Posted by dwasifar

I wouldn't go near that kind of shit.

All this stuff works the same way, by messing with your oil viscosity. Thicken the oil, it sticks to stuff more. And yes, this can help temporarily in those areas of your engine that have grown a little sloppy with wear. But it also causes oil to stick in places you DON'T want it sticking, like the oil galleys in the block, for instance, and you're making the entire oil system work harder to move the oil around.

Basically these products turn your oil into goo, reducing oil flow inside the engine and thereby reducing lubricating efficiency and increasing engine wear. Engine oil is intended as a lubricant, not a sealer. The more you make it into a sealer, the less effective it is as a lubricant.

The only time I'd use this stuff is if I was about to trade a car in and wanted to stop it burning oil long enough to unload it on a dealer.