STP Oil Treatment 400mL

Give your engine the long life it deserves with STP Oil Treatment in the blue bottle. This high-viscosity formula enhances both conventional and synthetic motor oils to protect your engine from wear and friction. Fortified with zinc anti-wear agents (ZDDP), it reduces metal-to-metal contact, helps minimize oil consumption, and improves lubrication in high-temperature conditions. Ideal for cars, trucks, and SUVs, it adds an extra layer of protection for engines under heavy loads or older vehicles with high mileage. Add one 400 mL bottle to every 4–5 quarts of oil during each oil change for best results.