2-in-1 formula for high & low mileage vehicles. Protects against wear & breakdown. Helps top squeals. STP Power Steering Fluid + Stop Leak is scientifically engineered to reduce fluid loss caused by seals that leak due to wear or shrinkage. Contains zinc diakyl dithiophosphate (ZDDP) anti-wear agent to help protect against wear and pump breakdown. Contains foam inhibitors to help provide quiet, efficient pump operation. Contains corrosion inhibitors to help fight corrosive attack. Contains seal swell agent and conditioner to help revitalize dried, hardened and shrunken seals. Can be used instead of regular power steering fluid as preservative maintenance. Compatible with all approved power steering fluids. Questions or comments? Visit www.stp.com or call 1-888-Go4-Stp1 in USA. Made in USA.