10 bestDiesel Additivesof June 2025
112M consumers helped this year.
1
Hot Shot's Secret Everyday Diesel Treatment 16 Ounce Squeeze Bottle (HSSEDT16ZS)
Hot Shot's Secret
9.8
2
Hot Shot's Secret - P040464Z Diesel Extreme Clean and Boost - 64 fl. oz.
Hot Shot's Secret
9.6
3
Royal Purple 11723-6PK Max-Clean Fuel System Cleaner and Stabilizer, 20-Ounce Bottle, Pack of 6
Royal Purple
9.4
4
STANADYNE DIESEL PERFORMANCE FORMULA - 64 OZ.
Stanadyne
9.1
8% off
5
Hot Shot's Secret HSS64Z Original Stiction Eliminator 64 Fluid Ounce Bottle, Green
Hot Shot's Secret
8.9
OtherUp to 9% off
Hot Shot's Secret Diesel Winter Anti-Gel 16 Ounce Squeeze Bottle
Hot Shot's Secret DDD Diesel Oil and Fuel Additive - 128 fl. oz.
Howes Diesel Defender 64-Ounce Injector Cleaner and Diesel Fuel Lubricator
Howes 103062 'Diesel Treat' Diesel Conditioner and Anti-Gel - 1 Quart
6
4 Bottles of Stanadyne 38564 Performance Formula 8 oz Diesel Fuel Additive by Stanadyne
Stanadyne
8.6
7
Stanadyne Performance Formula Diesel Fuel Additive case of 24 x 8 oz.
8.3
8
Liqui Moly 2002 Super Diesel Additive - 300 ml
Liqui Moly
8.0
9
Stanadyne Performance Formula Diesel Fuel Additive - 16 Oz. Case of 12 by Stanadyne
Stanadyne
7.7
10
Stanadyne 43566 Performance Formula Injector Cleaner, 32 oz
Stanadyne
7.4
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A Guide to Selecting the Best Diesel Additives
Choosing the right diesel additive can help improve your engine’s performance, protect its components, and even extend its lifespan. Diesel additives are chemical compounds you add to your fuel tank to address specific issues like fuel system cleanliness, cold weather performance, or lubrication. The best way to pick the right additive is to understand your vehicle’s needs, your driving conditions, and what you want to achieve—whether it’s better fuel economy, smoother starts in winter, or cleaner injectors.
Type of Additive
Diesel additives come in several types, each designed for a specific purpose. The main categories are fuel stabilizers, cetane boosters, anti-gel additives, lubricity improvers, and injector cleaners. Knowing what each type does is important because you should match the additive to your needs. For example, if you drive in cold climates, anti-gel additives prevent your fuel from thickening. If you want to keep your engine clean, injector cleaners are the way to go. Always start by identifying the problem you want to solve or the benefit you want to gain.
Cetane Number Improvement
Cetane number is a measure of how easily diesel fuel ignites under pressure. Cetane boosters increase this number, leading to smoother engine operation and easier starts, especially in cold weather. Cetane numbers typically range from low (40-45) to high (50+). If your engine is hard to start or runs rough, a higher cetane additive can help. For most modern engines, a moderate boost is sufficient, but older engines or those used in extreme conditions may benefit from higher cetane levels.
Anti-Gel Properties
Anti-gel additives prevent diesel fuel from thickening or gelling in cold temperatures, which can clog fuel lines and filters. These additives are especially important if you live or travel in areas where temperatures drop below freezing. Anti-gel effectiveness is usually rated by the lowest temperature at which it keeps fuel flowing. If you rarely encounter freezing temperatures, you may not need this feature, but for regular winter driving, it’s essential.
Lubricity Enhancement
Lubricity refers to how well the fuel can lubricate engine parts, especially the fuel pump and injectors. Modern ultra-low sulfur diesel can lack natural lubricants, so additives can help reduce wear and tear. Lubricity additives are important for older engines or any engine that seems to run noisier or rougher than usual. If you want to protect your engine’s moving parts and extend its life, look for additives with strong lubricity claims.
Injector Cleaning
Injector cleaners help remove deposits from fuel injectors, which can improve fuel atomization, combustion, and overall engine performance. Clean injectors mean better fuel economy and smoother running. If you notice poor acceleration, rough idling, or increased smoke, an injector cleaner can help. For regular maintenance, using a cleaner every few thousand miles is a good idea, but if you have persistent issues, a more concentrated formula may be needed.
Water Removal
Water can get into diesel fuel from condensation or poor storage, leading to corrosion and poor engine performance. Some additives help disperse or remove water from the fuel system. If you store diesel for long periods or live in humid areas, water-removing additives are especially useful. If you notice symptoms like sputtering or rust in the fuel system, consider an additive with water-removal properties.
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