10 bestEngine Additivesof August 2025
112M consumers helped this year.
11% off
1

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

9.9
2

Wynn's Extreme Diesel System Cleaner - Deep Cleaning Engine Treatment - Restores Fuel Economy & Reduces Emissions - Prevents Turbo, EGR Valve & DPF Issues - 325ml
Wynn's

9.8
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

9.7
6% off
4

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

9.5
7% off
5

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
Redex

9.3
OtherUp to 21% off
6

LIQUI MOLY Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2427
Liqui Moly

9.1
25% off
7

STP Diesel Fuel Additive Twin Pack
STP

8.8
14% off
8

Wynn's Diesel Power 7 Complete Action Fuel Additive Optimises Engine Performance 1L
Wynn's

8.6
30% off
9

LIQUI MOLY Oil Additive | 300 ml | Oil additive | SKU: 2591
Liqui Moly

8.3
18% off
10

Lucas Oil 10001 Heavy Duty Oil Stabiliser, 946 ml
Lucas Oil

8.0

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