Diesel engines demand more from their fuel than just combustion. Over time, deposits build up, lubricity drops, and cold starts become harder. A quality fuel additive can restore performance, protect your injection system, and even improve fuel economy.
This guide breaks down ten leading diesel fuel additives, from everyday treatments to deep-cleaning formulas, so you can choose the right one for your driving habits and engine needs.
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Hot Shot's Secret Everyday Diesel Treatment EDT, 16 oz
Best forDaily maintenance and protection
- Boosts cetane up to 7 points
- Cleans injector deposits effectively
ConsiderSmall bottle size
Archoil Diesel Fuel System Kit – AR6400-D (12 oz) + AR6500 (40 oz) – Comple…
Best forComplete fuel system restoration
- Two-step clean and maintain
- Works on all diesel engines
ConsiderRequires two-step process
Archoil AR6500 Diesel Treatment (40 oz) Treats 400 Gallons, Diesel Fuel Add…
Best forLubricity and cetane improvement
- Improves lubricity by 43%
- Boosts cetane up to 8 points
ConsiderLarge bottle may be bulky
Archoil AR6500 Diesel Treatment (40 oz) Two Pack – Treats 800 Gallons, Dies…
Best forLong-term value and bulk use
- Treats 800 gallons total
- Cost-effective per use
ConsiderRequires storage space
Hot Shot's Secret Everyday Diesel Treatment EDT, 1 Gallon
Best forBulk users and frequent drivers
- Cost-effective per ounce
- Same effective formula
ConsiderLarge container may be heavy
Archoil AR6400-D Diesel Fuel System Cleaner (12 oz) Deep Clean – Injector C…
Best forDeep cleaning injectors and DPF
- Rapid-acting deep clean
- Restores injector spray patterns
ConsiderNot for daily use
Lucas Oil 10013 Fuel Treatment – 1 Gallon
Best forMulti-fuel compatibility
- Works for gas and diesel
- Cleans entire fuel system
ConsiderNot diesel-specific
4 Bottles of Stanadyne 38564 Performance Formula 8 oz Diesel Fuel Additive
Best forCold weather and anti-gel
- Anti-gel protection
- Improves performance and horsepower
ConsiderSmall bottles may need frequent use
Hot Shot's Secret Everyday Diesel Treatment EDT, 16 oz 2-Pack
Best forConvenience and portability
- Two bottles for flexibility
- Same effective formula
ConsiderMore expensive than bulk
Hot Shot's Secret Diesel Extreme Fuel Additive, 1 Gallon
Best forHeavy deposit removal
- Cleans IDIDs and EDIDs
- Boosts cetane up to 7 points
ConsiderMay be too strong for regular use
Hot Shot's Secret EDT 16 oz – Everyday Diesel Care
Brand: Hot Shot's Secret
A reliable everyday additive for maintaining diesel engine health and performance.
Hot Shot’s Secret Everyday Diesel Treatment is designed for regular use to keep your engine in top condition. It boosts cetane by up to 7 points, which helps improve fuel economy and reduce maintenance costs over time. The formula also cleans internal and external injector deposits, enhancing fuel lubricity to protect critical components like the pump and injectors.
Beyond cleaning, this additive prevents rust and corrosion by demulsifying moisture and adding stability to your fuel. That means you can trust it to safeguard your fuel system even during storage or infrequent use. For a simple pour-and-go solution that supports long-term engine health, this 16-ounce bottle is a solid choice.
- Boosts cetane up to 7 points
- Cleans injector deposits effectively
- Prevents rust and corrosion
- Small bottle size
- May need frequent refills
Archoil Diesel Fuel System Kit – Complete Restoration
Brand: Archoil
An effective kit for restoring and maintaining your diesel fuel system.
This two-step kit from Archoil gives you a full fuel system reset. The AR6400-D cleaner is meant to be used first for a deep clean—just 12 ounces treats 30 to 40 gallons. After that, you switch to the AR6500 treatment at every fill-up for ongoing protection, with 40 ounces covering up to 400 gallons.
The kit works on all diesel engines, including modern high-pressure common rail systems. It removes injector deposits and restores spray patterns, which leads to smoother running, better throttle response, and more efficient combustion. If you want a complete clean-and-maintain routine without buying separate products, this kit simplifies the process.
- Two-step clean and maintain
- Works on all diesel engines
- Restores injector spray patterns
- Requires two-step process
- Higher upfront cost
Archoil AR6500 40 oz – Lubricity and Cetane Boost
Brand: Archoil
A strong additive for protecting your fuel system and improving combustion.
Archoil AR6500 is a maintenance additive you can add at every fill-up. Its long neck and measuring chamber make dosing simple, and one 40-ounce bottle treats up to 400 gallons. It’s suitable for all diesel engines, from light-duty pickups to heavy-duty RVs.
This formula improves lubricity by 43% according to ASTM D6079 testing, which helps protect wear-sensitive parts like the CP4 pump. It also boosts cetane by up to 8 points, leading to faster ignition and smoother combustion. Many engines run noticeably better with regular use, making it a practical choice for daily drivers.
- Improves lubricity by 43%
- Boosts cetane up to 8 points
- Easy measuring chamber
- Large bottle may be bulky
- Requires consistent use
Archoil AR6500 2-Pack – Value for Long-Term Use
Brand: Archoil
A practical value pack for regular users who want consistent protection.
If you drive a lot or own multiple diesel vehicles, this two-pack of Archoil AR6500 offers better value. Each 40-ounce bottle treats up to 400 gallons, so you get 800 gallons of treatment total. The formula is identical to the single bottle, with the same lubricity and cetane benefits.
You still get the easy fill-up dosing and protection for all diesel engines, including modern HPCR systems. The two-pack ensures you won’t run out mid-maintenance, and it’s convenient for fleet owners or those who prefer to stock up. If you already trust AR6500, this bundle saves you from frequent reordering.
- Treats 800 gallons total
- Cost-effective per use
- Same trusted formula
- Requires storage space
- May be overkill for occasional drivers
Hot Shot's Secret EDT 1 Gallon – Bulk Economy
Brand: Hot Shot's Secret
A smart bulk purchase for those who use diesel additive regularly.
For those who prefer buying in bulk, the 1-gallon jug of Hot Shot’s Secret Everyday Diesel Treatment offers the same benefits as the 16-ounce version but at a lower cost per ounce. It’s designed for everyday use to maintain engine health, boost cetane by up to 7 points, and clean injector deposits.
The gallon size is ideal for truck owners who log many miles or have multiple diesel engines. You get the same rust and corrosion prevention, along with fuel stability, without the need to reorder frequently. If you’re committed to regular treatment, this larger container simplifies your routine.
- Cost-effective per ounce
- Same effective formula
- Reduces reorder frequency
- Large container may be heavy
- Not travel-friendly
Archoil AR6400-D 12 oz – Deep Clean Specialist
Brand: Archoil
A powerful cleaner for restoring fuel system performance when needed.
Archoil AR6400-D is a concentrated cleaner designed for a deep clean of your fuel system. One 12-ounce bottle treats 30 to 40 gallons, and you simply pour it in and drive normally. It’s recommended every 5,000 miles or as needed to tackle performance-robbing deposits.
This rapid-acting formula works quickly to remove injector deposits and restore spray patterns, which translates to smoother running and better response. It also helps reduce DPF deposit buildup, potentially lowering regeneration frequency. If your engine feels sluggish or you suspect injector issues, this is a targeted solution.
- Rapid-acting deep clean
- Restores injector spray patterns
- Supports DPF performance
- Not for daily use
- Limited to 30-40 gallons per bottle
Lucas Oil 10013 – Versatile Fuel Treatment
Brand: Lucas Oil
A versatile additive that suits mixed fleets or households with different engines.
Lucas Oil’s fuel treatment is marketed as the world’s #1 fuel additive, and it works for both gasoline and diesel engines. That versatility makes it a handy product if you have multiple vehicles. It’s described as a tune-up in a bottle, treating fuel and increasing MPG.
The formula cleans and lubricates the entire fuel system, including injectors, carburetors, and combustion chambers. It also helps improve fuel economy by burning excess exhaust emissions. For a straightforward, multi-purpose additive, this gallon jug offers broad compatibility and dependable results.
- Works for gas and diesel
- Cleans entire fuel system
- Improves fuel economy
- Not diesel-specific
- May lack cetane boost
Stanadyne 38564 4-Pack – Winter Protection
Brand: Stanadyne
A reliable winter companion for preventing fuel gelling and maintaining performance.
Stanadyne’s Performance Formula comes in a 4-pack of 8-ounce bottles, giving you multiple doses for convenience. It’s designed to improve performance and horsepower, with a focus on cold weather and anti-gel protection. That makes it a smart choice for winter driving.
Beyond cold-weather benefits, it improves fuel economy and lubricates, cleans, and protects your fuel system. The smaller bottles are easy to store and carry, so you can keep one in your truck for emergency use. If you face freezing temperatures, this additive helps prevent gelling issues.
- Anti-gel protection
- Improves performance and horsepower
- Compact 8 oz bottles
- Small bottles may need frequent use
- Limited to 4 doses
Hot Shot's Secret EDT 2-Pack – Convenient Duo
Brand: Hot Shot's Secret
A convenient option for those who want the benefits of EDT in a portable size.
This 2-pack of Hot Shot’s Secret Everyday Diesel Treatment gives you two 16-ounce bottles, making it easy to keep one in your garage and one in your vehicle. Each bottle offers the same cetane boost, injector cleaning, and corrosion prevention as the single bottle.
The convenience factor is high—you won’t have to worry about running out mid-treatment. It’s ideal for those who want the benefits of EDT without committing to a gallon jug. Whether you have one truck or several, this pack ensures you’re always prepared.
- Two bottles for flexibility
- Same effective formula
- Easy to store
- More expensive than bulk
- Not as cost-effective per ounce
Hot Shot's Secret Diesel Extreme – Heavy-Duty Cleaner
Brand: Hot Shot's Secret
A powerful cleaner for tackling stubborn deposits and protecting your fuel system.
Hot Shot’s Secret Diesel Extreme is a more intensive cleaner compared to the Everyday Treatment. It’s designed to thoroughly clean, lubricate, and safeguard all engine and fuel system components, including valves and pumps. This makes it a good choice for addressing existing deposit issues.
The formula targets internal and external diesel injector deposits (IDIDs and EDIDs) and other stubborn buildup. It also boosts cetane by up to 7 points for better combustion and fuel economy. Plus, it includes a non-alcohol water dispersant with military-grade rust and corrosion protection, adding an extra layer of defense.
- Cleans IDIDs and EDIDs
- Boosts cetane up to 7 points
- Military-grade corrosion protection
- May be too strong for regular use
- Large gallon size
Buyer’s Guide: What to Consider
Choosing the right diesel fuel additive depends on your engine’s needs and your driving conditions. Here are five key factors to consider before making a purchase.
- Cetane Boost: Cetane rating measures fuel ignition quality. A higher cetane number means faster and more complete combustion, leading to smoother operation, better cold starts, and improved fuel economy. Additives that boost cetane by several points can make a noticeable difference, especially in older engines or during winter.
- Lubricity: Diesel fuel has naturally low lubricity, which can cause wear on fuel pumps and injectors. Additives that improve lubricity, as measured by ASTM D6079, help protect these critical components. Look for products that specify a percentage improvement, like Archoil's 43% claim, to ensure adequate protection.
- Injector Cleaning: Deposits on injectors can disrupt spray patterns, reducing efficiency and power. Some additives are designed for deep cleaning, while others maintain cleanliness with regular use. If your engine is already experiencing issues, a dedicated cleaner like AR6400-D may be necessary before switching to a maintenance formula.
- Cold Weather Performance: In freezing temperatures, diesel fuel can gel, clogging filters and preventing starts. Anti-gel additives lower the pour point and keep fuel flowing. If you live in a cold climate, consider a product with explicit anti-gel properties, such as Stanadyne's Performance Formula, to avoid winter breakdowns.
- Frequency of Use: Some additives are meant for every fill-up, while others are used periodically. Daily treatments are convenient and help maintain performance, but they can be costlier over time. Deep cleaners are used less often, making them more economical for addressing specific issues. Choose based on your driving habits and maintenance schedule.
Conclusion
Diesel fuel additives serve different purposes, from everyday maintenance to deep cleaning and winter protection. The best choice depends on your specific situation—whether you need a simple cetane boost, injector cleaning, or anti-gel protection.
For most drivers, a quality everyday treatment like Hot Shot’s Secret EDT or Archoil AR6500 offers a good balance of benefits. If you face cold winters, Stanadyne’s anti-gel formula is worth considering. For existing deposit issues, a deep cleaner like Archoil AR6400-D can restore performance. Evaluate your needs and choose accordingly.
Erica Steven is the founder and lead writer of WorstBrands, a site dedicated to providing honest and trustworthy reviews about outdoor gear and fashion products.
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