STP 1 Tank Tune Up Fuel Additive Fuel System Cleaner and Exhaust System Cleaner, Cleans Fuel Injectors, Intake Valves, Cylinder Head and Piston Tops, 12 Fl Oz
- One 12 fl oz STP 1 Tank Tune Up Fuel Additive reduces hydrocarbon emissions up to 50% and protects and maintains your catalytic converter
- Reduces the release of harmful exhaust emissions into the environment
- Cleans dirty oxygen sensors to help prevent failure and malfunction
- Helps pass emissions test and improves fuel economy
- Deep cleans fuel intake system including fuel injectors, intake valves, cylinder head and piston tops
- Helps quiet rough running engines and eliminates hesitation and hard starts
- Reduces knocking and cleans spark plus