Lucas Hydraulic Oil Booster & Stop Leak is a one of a kind, long lasting blend of oils and petroleum extracted additives that add lubricity and thermal stability to any hydraulic oil. Lucas Hydraulic Oil Booster & Stop Leak is an excellent preventative maintenance product at a treat rate of only about 5%, adding life to pumps, rams, seals and the treated hydraulic fluid. This product is unsurpassed at correcting existing problems. A 10% to 20% treat rate is usually all that is needed to stop all seal leaks. A 10% to 20% addition is usually all that's needed to restore full hydraulic pressure to a worn system. It also removes varnish from wet brakes and stops slip in automatic transmissions. It is impregnated with anti-foam agents.