Purpose and Specifications

STP Petrol Emissions Reducer is a powerful 400ml fuel additive designed to clean your petrol engine's fuel system and slash harmful exhaust emissions. Pour the entire bottle into a fuel tank holding 50-60 litres (about 21 gallons) at least one tankful before your emissions test or MOT. It removes stubborn deposits, gum, and varnish from injectors, carburettors, and valves, helping your car pass emissions checks first time while boosting fuel efficiency and smoother performance.

• Cuts emissions for better air quality and roadworthy status
• Cleans key fuel system parts that impact exhaust output
• Saves on fuel by restoring efficient combustion
• Safe for all petrol engines, including modern capless fuel systems
• Treats up to 60 litres per bottle - perfect for one full tank

Net weight: 0.406kg. Ideal for vehicles over 50,000km or due for annual checks. Shelf life: 3-5 years unopened in cool, dry storage (5-25°C).

When to Use / Replace?

Use STP Petrol Emissions Reducer before emissions tests, if your car fails MOT on emissions, or every 10,000km/12 months for maintenance in high-mileage petrol engines. Notice black smoke, rough idling, or dropping MPG? Add it to restore power. One bottle per treatment; repeat every 3-6 months for ongoing cleanliness in stop-start city driving.

Frequently Asked Questions

Will it help my car pass the emissions test?
Yes, it's formulated as a pre-test treatment to clean emission-related components and lower exhaust levels for a higher pass rate.

Is it safe for my daily driver?
Absolutely - safe for all petrol engines, including fuel-injected and carburetted models with capless tanks.

How soon do I see results?
Drive one full tank after adding; emissions drop and performance improves as deposits dissolve.