10 bestEngine Additivesof December 2025
112M consumers helped this year.
26% off
1
STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner and Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UK
STP
9.8
47% off
2
STP Ultra 5 in 1 Diesel Fuel 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
3
Archoil AR6900-D Max Advanced Diesel Additive Concentrate, 1L Treats 1,000L of Fuel, Diesel Fuel Injector Cleaner, DPF Filter EGR Valve Turbo Cleaner, Super Diesel Converter. (1Litre)
Archoil
9.4
12% off
4
LIQUI MOLY Cera Tec 3721 I Ceramic Wear & Tear Protection for Petrol & Diesel Engines I Smoother Engine Performance, Less Friction & Lower Fuel Consumption I Ceramic Additive 300 ml Pack of 1
Liqui Moly
9.2
14% off
5
STP Diesel High Milage Injector Cleaner 200 ml, Cleans and Protects your Engine for 300 miles, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK
STP
9.0
OtherUp to 53% off
Redex Diesel Fuel System Cleaner 250ml, Diesel Additives To Remove Harmful Emissions, Maximise Performance & Increase Fuel Economy With Redex Fuel Additives For Diesel Engines, Suitable For Hybrids
LIQUI MOLY Oil Additive | 300 ml | Oil additive | SKU: 2591
WYNNS Formula Gold Engine Oil Treatment - Improves Compression & Reduces Wear - Enhances Oil Viscosity & Cleans Engine Internally - 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)
34% off
6
Wynn's Diesel Power 7 Complete Action Fuel Additive Optimises Engine Performance 1L
Wynn's
8.7
7
Wynn's Extreme Diesel System Cleaner - Deep Cleaning Engine Treatment - Restores Fuel Economy & Reduces Emissions - Prevents Turbo, EGR Valve & DPF Issues - 325ml
Wynn's
8.4
8
LIQUI MOLY Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2427
Liqui Moly
8.1
18% off
9
Lucas Oil 10001 Heavy Duty Oil Stabiliser, 946 ml
Lucas Oil
7.8
10
TECHRON PEA Concentrate Plus Petrol Fuel Injector System Cleaner - 300ml
TECHRON
7.5
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