Hy-Per Lube Zinc Replacement Additive - 12 oz.

This is a very good substitute for Zinc Phosphorous additive. This would be preferable for cars with catalytic converters since it won't contaminate the converter. It definitely quieted the lifters in my solid lifter car and also in my generator. I have also used it in my 1996 Chrysler Sebring with hydraulic lifters. Although somewhat subjective, it seems to make the engine run smoother and quieter. I don't hear the start up valve lifter noise that I sometimes heard. This is a ester base oil additive and I noticed that it does thicken a little when very cold around 10 deg F. Not sure if this could be used for cars using 0w-20 motor oil with variable valve timing in the winter. Tempted to try it in my2015 Mazda 6 with variable valve timing.

I have a 2007 BMW 328i (N52 normally-aspirated engine) with 106,000 miles. In the last year, I noticed if my car was not driven for several days in temps below 50, the lifters ticked loudly for several minutes until the oil reached operating temperature. I researched this and through recommendations on bobistheoilguy.com decided to try this. I think it's kind of expensive but it completely cured my problem. My BMW holds 6.9 quarts of oil (I run Mobil 1 0W-40 Euro). I use 1/2 of this bottle (6 oz.) with each oil change. My tick has not returned and my engine is slightly quieter and smoother sounding.

This product has protected my engines in every way. My sand rail runs at 5 to 6 thousand RPMS most of the time. Never let's me down. Reduces ware significantly in the engines. My turbo vehicles love it. Smooth running at all RPMS. In all temperatures. I always use it in every oil change.

I'm not sure how this stuff is advantageous. Ideally I'd like to see some scientific proof and I'll keep adding every oil change, otherwise once in a lifetime is enough.

Great ZDDP alternative for those of use with flat tappet lifters. My 1999 TJ has ~215k mile on the old 4.0 I6. Newer oils tend to not have enough zinc to properly lubricate the flat tappet lifters on these old-style engines. Using this additive quieted those lifters down very nicely! Once again, a Hyper-Lube product works great! I also use their coolant additive.