Review on AR9100 Friction Modifier - 1 Gallon Bottle For Treating Up To 128 Quarts Of Engine Oil by Jim Ball

I'm a firm believer in this product. I have a vehicle that has over 200k miles, I originally purchased it with 140k (chrysler 3.8). It had upper end noise from sticky lifters or something. Added 4 oz+ to my engine oil change of mobil 1 synthetic, and almost immediately it started quieting down. Over the next 100 miles it got smoother and quieter. It had a lot more power/torque from it infiltrating the dirty piston rings too. I've used it on several other vehicles in my roster, family members vehicles, small engines, etc. I can't rave about it enough because I've had around the same results on all of them, especially used vehicles I've purchased that might have had dino oil before, or ones that I had run mobil one for some time prior. Before I've bought around three 16oz bottles, next purchase will be for the gallon.