Today’s engines can form harsh deposits that can lead to reduced performance and efficiency. STP High Mileage Complete Fuel System Cleaner has a propriety blend of PEA and PIBA detergents to help remove harmful deposits in any gasoline engine with over 75,000 miles. With 2x the amount of cleaning agents vs the leading premium gasoline*, this high mileage additive will deep clean your vehicle’s fuel system for optimum power. *Amount of cleaning agents per bottle measured by weight, compared to 28 gallons of the leading premium gasoline for 12 fl oz size bottle, and 21 gallons for 5.25 fl oz size bottle.​