10 bestDiesel Oil Additivesof July 2026
112M consumers helped this year.
37% 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
9.8
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
9.6
8% off
3
STP Diesel Injector Cleaner 200 ml, Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK
STP
9.4
4
Archoil AR6400-D MAX Pro DPF Cleaner Diesel - Diesel Injector and Particulate Filter Treatment - Fuel System Cleaner - EGR, Turbo and Emissions Additive for MOT Pass - 400ml Concentrate
Archoil
9.2
5
Archoil AR6900-D Max Advanced Diesel Additive Concentrate, 2 x 250ml Treats 500L of Fuel, Diesel Fuel Injector Cleaner, DPF Filter EGR Valve Turbo Cleaner, Super Diesel Converter. (2 x 250ml)
Archoil
8.9
OtherUp to 7% off
Millers Oils 2 X Diesel Power Ecomax 500ml, Fuel Additive Treatment
Lucas Oil 10013 Fuel Treatment-3.78L, clear yellow
Wynn's 1831090 Stop Smoke For Oil Additive For Reducing Petrol & Diesel Engine Exhaust Emissions, Purple, 325ml (Pack of 2)
WOL Diesel Additive Injector Cleaner Liqui Moly Super Diesel Additive 250ml - Fuel System Cleaner - DPF Cleaner Diesel 1806 - Diesel Particulate Filter Cleaner (3 UNIT)
6
Archoil AR6400-D MAX Pro Diesel Engine, Turbo, DPF Cleaner 400ml & AR6900-D 250ml
Archoil
8.6
29% off
7
STP Diesel Treatment 200 ml, Keeps your Fuel System Clean, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK, Black/Blue
STP
8.4
8
Wynn's Extreme Diesel System Cleaner - Deep Cleaning Engine Treatment - Restores Fuel Economy & Reduces Emissions - Prevents Turbo, EGR Valve & DPF Issues - 325ml
Wynn's
8.1
33% off
9
LIQUI MOLY Pro-Line Engine Flush | 500 ml | Oil additive | SKU: 2427
Liqui Moly
7.8
9% off
10
Wynn's High Performance Diesel Fuel System Treatment - Enhances Combustion, Improves Acceleration, Reduces Fuel Consumption & Black Smoke - 500ml
Wynn's
7.6
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A Guide to Selecting the Best Diesel Oil Additives
When choosing diesel oil additives, it's important to understand that these products are designed to enhance the performance and longevity of your diesel engine. They can help improve fuel efficiency, reduce emissions, and protect engine components from wear and tear. The right additive can make a significant difference in how your engine performs, especially under demanding conditions. To select the best diesel oil additive for your needs, consider the specific requirements of your engine, the driving conditions you typically encounter, and any particular issues you are experiencing with your vehicle.
Detergent Additives
Detergent additives are crucial for keeping your engine clean by preventing the buildup of deposits on engine parts. These deposits can affect engine performance and efficiency. Detergent additives work by breaking down and removing these deposits, ensuring smoother operation. If you frequently drive in stop-and-go traffic or use your vehicle for short trips, you might benefit from a higher concentration of detergent additives to keep your engine clean.
Cetane Boosters
Cetane boosters are additives that increase the cetane number of diesel fuel, which is a measure of the fuel's combustion quality. A higher cetane number can lead to better engine performance, easier starting, and reduced emissions. If you notice your engine is hard to start or runs roughly, a cetane booster might be beneficial. For those driving in colder climates or with older engines, a higher cetane number can be particularly advantageous.
Lubricity Enhancers
Lubricity enhancers are additives that improve the lubricating properties of diesel fuel, which is essential for protecting engine components from wear and tear. This is especially important for modern engines with high-pressure fuel systems. If you have a newer vehicle or drive long distances regularly, ensuring your fuel has adequate lubricity can help extend the life of your engine components.
Anti-Gel Additives
Anti-gel additives are designed to prevent diesel fuel from gelling in cold temperatures, which can cause starting problems and fuel system blockages. These additives are particularly important for those living in colder climates or during winter months. If you experience cold weather conditions, using an anti-gel additive can ensure your vehicle starts reliably and runs smoothly.
Corrosion Inhibitors
Corrosion inhibitors are additives that protect metal surfaces within the engine and fuel system from rust and corrosion. This is important for maintaining the integrity and performance of your engine over time. If you live in a humid or coastal area where corrosion is more likely, or if your vehicle is not used frequently, a corrosion inhibitor can be a wise choice to protect your engine.
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