Rislone 4405 Hy-per Lube Zinc ZDDP Supplement, 11 oz. | Real ZDDP Zinc

The reason to add this to an oil change regimen is when you have a motor that has a flat tappet camshaft. Including this zinc additive to each oil change will protect your camshaft and lifters from premature failure due to changes in oil regulations that are present today. If you have such a motor I recommend this product as it will help you preserve the performance of your engine. It will help keep it running smoother with less engine noise and a lower temperature. Possibly resulting in better mileage and less leaks down the road.

Extremely impressed with product price and results, added entire bottle to a used Cummins with 158,000 miles on it, significant reduction in idle engine noise, smoothed out while running, old diesel seems to be very happy. No noticeable changes in mileage, but will be adding this along w/ 15w40 Rotella every oil change. I do recommend running truck for 15-30 minute drive after adding to ensure it just doesn't go down to the bottom of the pan, not sure if this is heavier or lighter than oil but anytime I use an additive I make sure to take a drive and ensure it's mixed in with oil right away for optimum results.

My 2002 Yukon XL with over 250k miles has started to burn oil. A lot of oil. In a bid to prevent further wear, I've been using this additive since the cats... mysteriously disappeared somewhat recently (don't use this if your vehicle has a catalytic converter). Much more substantive additive than something like Lucas that just increases the viscosity.

Have always used zinc supplements on rebuilds, a friend said put this in your RZR, and I did, No complaints, and Rislone has been around for years, not sure if it helps or not, but it's cheap enough to add in the hopes it helps..

A necessity for older car engines.

Great product!

Used on a 2005 Nissan Altima with slightly noisy lifters. quieted it down nicely

This works