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10 Best Fuel Additives For Petrol Engines - May 2026

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Last Updated: 27-05-2026

1

Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381

Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381

Briggs & Stratton

9.8

9.8

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2

STP Ultra 5 in 1 Petrol System Cleaner 400ml, Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK

STP Ultra 5 in 1 Petrol System Cleaner 400ml, Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK

STP

9.6

9.6

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3

Redex Petrol System Cleaner 250ml, Petrol Injector Cleaner To Remove Harmful Deposits, Maximise Performance & Increase Fuel Economy Fuel Additives For Petrol Engines, Suitable For Hybrids

Redex Petrol System Cleaner 250ml, Petrol Injector Cleaner To Remove Harmful Deposits, Maximise Performance & Increase Fuel Economy Fuel Additives For Petrol Engines, Suitable For Hybrids

Redex

9.5

9.5

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4

Wynn's Formula Gold High-Performance Petrol System Treatment - Enhances Engine Efficiency - Improves Acceleration & Reduces Noise - Cleans & Protects Fuel Injection System - 500ml

Wynn's Formula Gold High-Performance Petrol System Treatment - Enhances Engine Efficiency - Improves Acceleration & Reduces Noise - Cleans & Protects Fuel Injection System - 500ml

Wynn's

9.2

9.2

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5

LIQUI MOLY Fuel System Treatment | 300 ml | Petroladititive | SKU: 8365

LIQUI MOLY Fuel System Treatment | 300 ml | Petroladititive | SKU: 8365

Liqui Moly

9.1

9.1

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6

Cataclean Petrol | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Cataclean Petrol | Complete Fuel & Exhaust Cleaner | Catalytic Converter, Valve & Injector Cleaner | Fuel Additive Formulated for Performance & Fuel Efficiency | Pre MOT Emissions Reducer | 2 x 500ml

Cataclean

8.8

8.8

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7

Archoil AR6900-P Max Advanced PETROL Fuel Additive Concentrate, Treats 500L of Fuel, Petrol Injector Cleaner, GPF Turbo EGR Valve Cleaner, Super Unleaded Convertor (500ml)

Archoil AR6900-P Max Advanced PETROL Fuel Additive Concentrate, Treats 500L of Fuel, Petrol Injector Cleaner, GPF Turbo EGR Valve Cleaner, Super Unleaded Convertor (500ml)

Archoil

8.6

8.6

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8

2X Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381

2X Briggs & Stratton Fuel Fit Additive/Stabiliser. 992381

Briggs & Stratton

8.4

8.4

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9

STP GST50400EN ST50400EN Complete Petrol Fuel System Cleanner, 400 ml

STP GST50400EN ST50400EN Complete Petrol Fuel System Cleanner, 400 ml

STP

8.2

8.2

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10

Liqui Moly 1803 Injection Cleaner 300ml

Liqui Moly 1803 Injection Cleaner 300ml

Liqui Moly

8.1

8.1

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