STP® 1 Tank Tune Up™ is our most powerful fuel additive with the highest concentration of cleaning agents of any STP® fuel additive. Its proprietary blend is specially formulated to survive high temperatures in the combustion chamber, cleaning through the fuel intake system and the exhaust system, helping your engine run more smoothly and efficiently in a single use.One 12 fluid ounce STP® 1 Tank Tune Up™ Fuel Additive reduces hydrocarbon emissions up to 50% and protects and maintains your catalytic converterReduces the release of harmful exhaust emissions into the environmentCleans dirty oxygen sensors to help prevent failure and malfunctionHelps pass emissions test and improves fuel economyDeep cleans fuel intake system including fuel injectors, intake valves, cylinder head and piston topsHelps quiet rough running engines and eliminates hesitation and hard startsReduces knocking and cleans spark plugs

STP® 1 Tank Tune Up™ Fuel Additive

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