STP Gas Treatment Fuel System Cleaner — 5.25 fl oz Bottle Pack of 12, Injector & Intake Detergent, Water Dispersant

STP Gas Treatment is a concentrated fuel-system cleaner and water reducer designed to clear carbon, gum, and varnish from gasoline systems while helping reduce fuel-line freeze risk.

Keep your engine running smoothly by treating each tank with a reliable fuel additive. STP Gas Treatment uses a high-quality jet-fuel carrier to deliver active detergents throughout the intake and fuel system, addressing common deposits that can restrict flow, hamper performance, and reduce fuel economy. The formula also contains elements that help disperse water, mitigating the chance of fuel-line freeze in cold conditions.

How does STP Gas Treatment improve engine performance?

The treatment works by dissolving and loosening carbon, gum, and varnish that accumulate on intake valves, injectors, and fuel lines. Regular use helps restore proper spray patterns and fuel flow, which can support smoother idling and more consistent power delivery.

• Detergent agents clean fuel injectors and intake ports
• Helps restore consistent fuel spray and atomization
• Can reduce rough idling and hesitation caused by deposits

Will this product help in cold weather or prevent fuel-line freeze?

Yes—STP Gas Treatment includes ingredients that help remove small amounts of water from the fuel system and discourage ice formation in lines and filters. This is not an antifreeze replacement, but regular use reduces the risk of moisture-related freezing during winter storage or cold starts.

• Water-dispersing components help keep lines clear
• Useful as a seasonal preventive when temperatures drop
• Recommended to treat fuel before long cold-weather exposure

How do I use this 5.25 fl oz bottle—what’s the dosing and frequency?

Each 5.25 fl oz bottle is formulated for one tank treatment in most passenger vehicles—simply add it to the fuel tank when you fill up. For routine maintenance, use the product every few fill-ups or follow the vehicle manufacturer’s guidance for additives.

• One bottle typically treats a full tank for passenger cars
• Add at the pump when filling the tank for best dispersion
• Use regularly for preventive maintenance rather than only when problems appear

Is this safe for modern engines and fuel systems?

STP Gas Treatment is formulated to be compatible with gasoline engines and common fuel-system materials. It is designed for use in cars, vans, light trucks, and other small gasoline engines, but avoid use in diesel engines unless product labeling specifies otherwise.

• Compatible with standard gasoline and modern fuel-system components
• Not indicated for diesel or alternative-fuel engines unless labeled
• Follow label instructions and vehicle manufacturer recommendations

Who this is for: STP Gas Treatment is aimed at drivers and vehicle owners who want an easy, periodic way to maintain fuel-system cleanliness and reduce moisture-related fuel problems. It suits commuters, weekend drivers, fleet operators, and anyone preparing vehicles for seasonal storage. If you refill regularly and want to protect performance and fuel efficiency with a trusted automotive brand, this pack of 12 single-dose 5.25 fl oz bottles offers convenient, on-the-go treatments for multiple tanks.

• One 5.25 fl oz bottle per dose; pack contains 12 bottles
• Formulated with a jet-fuel carrier to deliver active cleaning agents
• Helps remove carbon, gum, varnish and disperses small amounts of water
• Use routinely at fill-ups for maintenance and cold-weather protection