Bar's Leaks Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz, Yellow

Great additive for old school engines, has zinc additive and have used for years.

I use this as directed for my 1999 Jeep 4.0L. Lots of critics on if its really needed, but as far as I am concerned, its better than finding out later Zinc was needed. Priced okay, hoping it works, I use it with semi-synthetic Pennzoil. I have 179,000 miles and still rolling.

Works great the old tractor wouldn't be without it!

I've been using this product for more than 30 years and it is especially important in Classic Car's high performance engines . Zinc use to be in the older oils but in the newer ones it was reduced or eliminated. For Classics and Antiques original engines MoBile 1 will leak through due to engine tolerances. My experience with original and rebuilt older engines even those that have changed gaskets, diaphragms, and other materials still have some type of leaks because of the viscosity of the synthetic oils. Adding Rislone is just replacing the zinc back into the newer oils which helps coat and adhere to the mechanical parts of the engine. Very Good product in my opinion.

I had no idea you need to add Zinc to modern motor oils. Poured a bottle this morning into my 1981 Jeep CJ5 258, and immediately noticed a difference. The performance was the same, but she runs a lot smoother now. Especially at higher speeds. Definitely going to be adding this to every oil change.

I've been using zinc supplements for rebuilds for a while now, but a friend recommended trying Rislone in my RZR. I must say, I have no complaints. Rislone has a longstanding reputation in the industry, so I decided to give it a shot. While I can't be certain of its impact, the price point makes it a worthwhile addition for potential benefits. Highly recommend!

Good quality product, easy to add to cars oil

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.

My wife and I have been experimenting with various lubes. Some we have tried have dried quickly causing a rash, some have started smoking after prolonged shaft vibration. Care is needed with this as the added zinc reduces friction so much, one sneeze and you can find yourself across the room in full flight.

Beaucoup plus facile d'utilisation que l'ancienne formule

I filled suggested amount per instructions. Used a syringe, on my 2015 corolla. Noticed, my idling dropped from 1000rpm to about half ,600rpm combined with a lower viscosity 0w16 oil. Although, it's not a large sample size. I can say, it does work, per my vehicle.

Just fine

Use this in my ram