10 bestEngine Additivesof April 2025
112M consumers helped this year.
47% off
1

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

9.9
7% off
2

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

9.8
3

Wynn's Extreme Diesel System Fuel Injector Cleaner Engine Additive Treatment 325ml
Wynn's

9.6
4

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

9.5
10% 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 17% off
6

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

9.0
23% off
7

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

8.8
15% off
8

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

8.5
14% off
9

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

8.2
25% off
10

STP Diesel Fuel Additive Twin Pack
STP

8.0

Best Reviews Guide Newsletter
Get exclusive articles, recommendations, shopping tips, and sales alerts
Sign up for our newsletter to receive weekly recommendations about seasonal and trendy products
Thank you for subscribing!
By submitting your email address you agree to our Terms and Conditions and Privacy Policy