Protect the engine in your high-mileage vehicle with STP High Mileage Oil Treatment + Stop Leak. Formulated especially for vehicles with over 75,000 miles, this high-viscosity engine additive includes ZDDP oil additive as an anti-wear agent for protection. This STP oil treatment creates a thick cushion between moving engine parts to help fight metal-to-metal friction. Engine stop leak helps to rejuvenate seals and gaskets and stop engine leaks, noise and smoking to improve performance. Add to engine oil with each oil change during car maintenance. It's suitable for cars, light trucks and SUVs.