Contains no harmful solvents. When power steering reservoir is low, refill it until the leak stops. In newer units add a small amount to existing power steering fluid to stop initial wear. Adds life to pumps and seals. Compatible with all power steering fluids. To correct worn rack and pinions, empty the reservoir and refill it. Results are immediate and long lasting. Totally controls slack, squeals, hard spots, and tight steering. This product can not fix mechanical failures and torn seals.