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Engineered with a special blend of high-performance detergents, cetane and lubricity improver, STP Ultra 5-In-1 is our most advanced formula. Designed to bring out the best in your car, STP Ultra 5-In-1 helps restore the performance you once enjoyed. So if you would like to enhance your engine and give your car the ultimate clean up resulting in more miles to the gallon, STP Ultra 5-In-1 is the perfect product for you and your vehicle.