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Two Trusted Brands

Extra Cleaning Power.
Over 2 times the EPA required minimum of detergent additives.
STP Logo

Helps Maintain Vehicle Performance. Helps Prevent Deposit Buildup.

Marathon Brand gasolines feature STP Additives, which help reduce intake valve deposits. Deposit buildup can harm engine performance and vehicle drivability. Lucky for you, Marathon gasolines with STP Additives are designed to help keep engines clean by preventing this deposit buildup1.


Helps Maintain Fuel Economy.

Even today's sophisticated electronic engine and emission control systems can accumulate heavy deposits on intake valves. This can cause fuel to be burned incompletely and inefficiently. Fortunately, Marathon gasolines with STP additives can help keep intake valves clean, which can lead to better fuel economy than fuels with lower levels of detergent additives.


Helps Control Vehicle Emissions.

By helping keep intake valves clean, engines have fewer deposits which can help lower harmful emissions like nitrogen oxides, hydrocarbons, and carbon monoxide in engine exhaust. Marathon gasolines with STP additives help clean engine intake valves2 and recude emissions.

Freedom Stripe

1When compared to gasolines using only the minimum EPA required dose of detergent additives
2As stated by the U.S. EPA, “the effective control of deposits in gasoline engines and fuel supply systems has been shown to reduce the emission of nitrogen oxides, hydrocarbons, and carbon monoxide in engine exhaust, while enhancing fuel economy”. In accordance with the U.S. Clean Air Act, section 211(1), United States Environmental Protection Agency, 40CFR Part 80, Final Rule - Regulation Fuels and Fuel Additives: Certification Standards for Deposit Control Gasoline Additives.

Marathon licenses the STP® trademark from The Armor All/STP Products Company.
For information regarding a specific product, please refer to that product's Material Safety Data Sheet