Bars Leaks Stop Leak helps your power steering system last longer. Works on rack & pinion units, gear boxes and pumps. Works with ALL domestic, import and heavy duty power steering fluid; including petroleum, mineral oil synthetics and Dexron ATF. Keeps power steering seals soft and pliable. Non-corrosive, non-clogging and non-foaming. Most leaks stop in 200 miles or 3 days of driving.