STP Fuel Injector Cleaner 5.25 fl oz — Super Concentrated, 12-Count Pack for Restored Acceleration and Fuel Economy

STP Super Concentrated Fuel Injector Cleaner is a powerful, jet-fuel–based treatment that dissolves carbon, gum and varnish to help restore injector function, acceleration and fuel economy.

If your vehicle suffers from hard starts, sluggish acceleration or uneven idling, buildup inside fuel injectors and intake passages is often a leading cause. This STP formula is designed to deliver a high concentration of detergents in a convenient 5.25 fl oz dose, using jet fuel as a carrier to move active ingredients quickly to problem areas. Packaged for professional and consumer use, the 12-count option keeps a garage stocked for multiple treatments or service intervals.

How does this cleaner improve engine performance?

The concentrated detergents break down sticky deposits that restrict spray patterns and fuel flow, helping injectors atomize fuel more evenly. Better atomization supports smoother combustion, which can translate to crisper throttle response and fewer misfires. Results vary by vehicle age and condition, but many users notice improved drivability after treatment.

• Targets carbon, gum and varnish on injector tips and ports
• Helps restore correct spray pattern for efficient combustion
• Can reduce rough idle and hesitation caused by clogged injectors

When should I use STP injector cleaner and how often?

Use the cleaner as part of routine maintenance or when symptoms appear—common triggers include decreased acceleration, hard starts, or rough idling. For regular preventative care, many owners treat fuel systems every few oil changes or per manufacturer service intervals. Heavier buildup or older engines might need repeated treatments spaced weeks apart.

• Use at first sign of drivability issues for best results
• Typical preventive interval: every few thousand miles or per schedule
• Repeat treatments can help with severe deposit buildup

Is this product compatible with modern fuel systems and fuel types?

Yes—this STP formula is compatible with vehicles that use cap-less fueling systems and works with standard gasoline blends. The jet-fuel carrier helps carry detergents into injectors effectively, and the product is formulated to be safe for typical fuel system materials when used as directed. Always follow vehicle manufacturer recommendations and do not exceed labeled dosages.

• Safe for cap-less gas systems
• Formulated for gasoline engines using common fuel blends
• Designed to be used directly through the fuel tank per label directions

What practical benefits will I notice after treatment?

After cleaning, many drivers observe improved throttle response and smoother idling as injectors return to correct flow and spray pattern. Better combustion efficiency can also reduce wasted fuel, so some owners see a modest improvement in fuel economy. The cleaner helps protect components by removing deposits that accelerate wear.

• Improved acceleration and drivability
• Potential fuel savings from more efficient combustion
• Reduces deposits that can contribute to long-term wear

Who is this for: STP Super Concentrated Fuel Injector Cleaner is intended for vehicle owners, home mechanics and fleet managers who want a concentrated, professional-strength treatment to address injector deposits and improve drivability. It suits gasoline-powered cars, trucks and SUVs—especially older or high-mileage engines showing symptoms of fuel system build-up. Follow the label for safe use and dose information to achieve the best results.