Bar's Leaks jack oil with stop leak is engineered to stop seal and O-ring leaks caused by normal jack wear and age. If you regularly have to add oil to your jack (and snow plow hydraulics), you're probably dealing with a leak. This formula renews old jacks and light hydraulics and prevents leaks and seepage on new jacks and hydraulics. Not to mention, it mixes with all approved hydraulic jack oils as well as snow plow fluids and works in all floor and bottle jacks. It's 100% safe non-corrosive, non-clogging and non-foaming.