Lucas Power Steering Stop Leak eliminates hard spots and stops seal leaks. This formula is a blend of special oils and petroleum-extracted additives. It contains no solvents. There are no harmful long term effects. As a matter of fact, it is an excellent preventative maintenance product for new units. If the system is leaking add Lucas Power Steering Stop Leak until leak stops, usually one bottle. Occasionally a second bottle is needed to completely stop some leaks. To eliminate squeals, whines and hard spots (morning sickness) some fluid must be sucked from fluid reservoir usually 6 to 12 ounces depending on severity of problem. Refill reservoir with Lucas Power Steering Stop Leak. Results are immediate and long lasting. Lucas Power Steering Stop Leak is guaranteed to stop seal leaks or your money back.