Well, I'm not usually one to try snake oils but I've had my eye on Zmax for years but couldn't bring myself to pay that much for it but...
The other day we were wrapping up school shopping at Kmart and they had just the Zmax oil treatment on sale for $10 so I figured what the heck... threw 12oz of it in my 02 F150 with 200k+ miles and even with Mobil 1 0w-40 in the sump I noticed a pretty drastic change in engine smoothness and most definitely in the startup noise, could it be that this stuff actually does something?? Nothing scientific at all but going down the road the engine does feel smoother overall and seems less "noisy" when next to jersey walls and such.
The other day we were wrapping up school shopping at Kmart and they had just the Zmax oil treatment on sale for $10 so I figured what the heck... threw 12oz of it in my 02 F150 with 200k+ miles and even with Mobil 1 0w-40 in the sump I noticed a pretty drastic change in engine smoothness and most definitely in the startup noise, could it be that this stuff actually does something?? Nothing scientific at all but going down the road the engine does feel smoother overall and seems less "noisy" when next to jersey walls and such.