A strong diesel additive should match your engine’s maintenance goal, fuel volume, and usage pattern, making it suitable for drivers, fleet operators, and equipment owners who want simpler fuel-system care. The 10 options here cover everyday treatment, injector cleaning, cetane improvement, lubricity, deposit control, cold-weather protection, and fuel storage. Some are compact bottles for occasional use, while others treat hundreds of gallons and make sense for regular fill-ups or larger tanks.
The key distinction is whether you need a cleaner, an ongoing treatment, a stabilizer, or a two-step approach. Check each label’s dosing directions and confirm compatibility with your diesel fuel, emissions equipment, and operating conditions before adding it to the tank.
The best additive for diesel engines depends on the job: choose an everyday treatment for routine care, a dedicated cleaner for deposits, a high-capacity formula for frequent fueling, or a stabilizer for stored fuel. The listed options include cetane boosters, injector cleaners, lubricity improvers, corrosion protection, anti-gel coverage, and DPF or turbo deposit control. Treatment capacity ranges from smaller single-use bottles to products treating up to 512 gallons, so dosing and use case matter as much as the formula.
Diesel Additives Compared
How We Compared These Products
We compared dimensions, capacity, materials, compatibility, included components, and care requirements across many Amazon listings. These details matter because the product must fit the available space, intended use, setup requirements, and maintenance routine. After examining the wider field, we selected 10 products from Hot Shot’s Secret, Archoil, Power Service, Lucas Oil, Liqui Moly, Stanadyne, Opti-Lube, and STA-BIL.
The shortlist includes products such as Hot Shot’s Secret Everyday Diesel Treatment EDT, Archoil AR6500 Diesel Treatment (40 oz) Treats 400 Gallons, and Power Service Diesel Kleen+Cetane Boost 64 oz. Every recommendation is tied to information stated for that specific product; unclear or missing features were treated as unknown rather than filled with assumptions.
Detailed Reviews: Best Additive For Diesel Engines
1. Hot Shot’s Secret Everyday Diesel Treatment EDT, 16 oz
Best for: Daily engine performance enhancer.
Keep your diesel engine in top condition with this everyday treatment designed to improve performance and maintain engine health. Regular use ensures your engine runs smoothly and efficiently, providing peace of mind on the road. It enhances fuel economy by boosting cetane levels.
This EDT boosts cetane levels by up to 7 points, directly contributing to better fuel economy and potentially reduced maintenance costs. Its liquid form and 16 oz squeeze bottle allow for easy application. Designed for regular use, it helps maintain engine health and ensures smoother, more efficient operation for your diesel vehicle.
Product Details
| Brand | Hot Shot's Secret |
|---|---|
| Included Components | Bottle |
| Item Form | Liquid |
| Item Volume | 473 ml |
| Item Weight | 16 ounces |
| Manufacturer | Lubrication Specialties, Inc |
| Model Number | HSSEDT16ZS |
Additional Product Information
| Size | 16 Fl Oz Squeeze |
|---|---|
| Warranty Description | 100% Money Back Guarantee |
| Additional Information | Important information |
Pros
- Improves performance and maintains engine health
- Boosts cetane levels by up to 7 points
- Enhances fuel economy
- Ensures smooth and efficient engine operation
Cons
- Only available in a 16 oz size
Ideal for daily use in all diesel engines seeking improved performance and fuel economy. Ensure regular application for sustained benefits, as it is designed for ongoing maintenance rather than a single deep clean.
2. Archoil AR6500 Diesel Treatment (40 oz) Treats 400 Gallons, Diesel Fuel Additive – Lubricity Improver, Injector Cleaner, DPF & Turbo Deposit Control, Cetane Booster
Best for: All-purpose diesel fuel treatment.
This diesel treatment is designed for easy use at every fill-up, with a measuring chamber for simple application. It's suitable for all diesel engines, including modern HPCR systems, and is tested to improve lubricity by 43%, protecting vital fuel system components.
The AR6500 formulation improves lubricity by 43% according to ASTM D6079 testing, which helps protect wear-sensitive fuel system parts. Its design allows for direct addition to the fuel tank at each fill-up, with one 40 oz bottle treating up to 400 gallons. This makes it a convenient, ongoing solution for light-duty to heavy-duty diesel vehicles.
Product Details
| Brand | Archoil |
|---|---|
| Item Weight | 2.94 pounds |
| Item model number | AR6500-40 |
| Manufacturer | Archoil |
| Part Number | AR6500-40 |
| Package Dimensions | 12.87 x 7.8 x 3.74 inches |
Pros
- Improves lubricity by 43%
- Suitable for all diesel engines
- Easy to use at every fill-up
- Treats up to 400 gallons per bottle
Cons
- Requires consistent addition at each fill-up for ongoing benefits
Recommended for all diesel vehicle owners who want continuous fuel system protection and improved lubricity. Best utilized as a regular additive to maintain optimal engine health and component longevity.
3. Archoil Diesel Fuel System Kit – AR6400-D (12 oz) + AR6500 (40 oz) – Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster
Best for: Complete diesel fuel system restoration kit.
This two-step kit offers a complete fuel system reset for all diesel engines, including modern HPCR systems. It combines a deep cleaning agent with an ongoing treatment to restore and maintain optimal engine performance and response.
The kit includes AR6400-D for a deep clean (12 oz treats 30-40 gallons) and AR6500 for ongoing protection (40 oz treats up to 400 gallons). This dual-action approach cleans injectors, restores response, improves lubricity, and controls deposits, providing a comprehensive solution for pre-emissions and modern diesel engines.
Product Details
| Brand | Archoil |
|---|---|
| Capacity | 40 fluid ounces |
| Item Volume | 976 ml |
| Manufacturer | Archoil |
| Size | 1 Count (Pack of 2) |
| Additional Information | Important information |
Pros
- Two-step clean and maintain solution
- Cleans injectors and restores response
- Improves lubricity and controls deposits
- Suitable for all diesel engines
Cons
- Requires two separate applications for full benefit
This kit is for diesel owners seeking a comprehensive restoration and ongoing maintenance plan. It's ideal for those who want to address existing issues and prevent future problems with a dual-action approach.
4. Power Service Diesel Kleen+Cetane Boost 64 oz, Pack of 1 3064-06 Grey
Best for: Diesel injector cleaner and cetane booster.
This additive cleans dirty injectors and prevents sticking in both High Pressure Common Rail (HPCR) and older diesel systems. It effectively removes internal and external deposits, restoring lost power and fuel economy while protecting against wear.
Containing Slickdiesel Lubricator, this formula protects fuel pumps and injectors from wear caused by Ultra Low Sulfur Diesel (ULSD) fuel. It cleans injectors, restores lost power and fuel economy, and is effective in all diesel fuels, including biodiesel blends. The 64 oz size offers substantial treatment capacity for various diesel vehicles.
Product Details
| Brand | Power Service |
|---|---|
| Item Weight | 4 pounds |
| Item model number | 3064-06 |
| Manufacturer | Power Service |
| Part Number | 3064-06 |
| Model | 3064-06 |
| Dimensions | 3.4 x 6.75 x 10.3 inches |
Pros
- Cleans dirty injectors and prevents sticking
- Restores lost power and fuel economy
- Protects fuel pumps and injectors from wear
- Effective in all diesel fuels, including biodiesel
Cons
- Contains chemicals known to the State of California to cause cancer and reproductive harm
Suitable for owners of older and modern diesel engines needing injector cleaning and performance restoration. It is a good choice for those using ULSD or biodiesel fuels and seeking enhanced power and economy.
5. Lucas Oil 10013 Fuel Treatment – 1 Gallon
Best for: All-in-one fuel system treatment.
This 1-gallon fuel treatment is designed for both gasoline and diesel engines, acting as a tune-up in a bottle. It cleans and lubricates the fuel system, improving fuel economy and increasing power and acceleration by enhancing fuel flow.
The 1-gallon container treats a significant volume of fuel, cleaning and lubricating injectors, carburetors, and combustion chambers. It neutralizes sulfur and other contaminants, leading to better fuel economy by burning excess exhaust emissions and increased power by reducing deposit buildup. This formula is designed to keep vehicles on the road longer.
Product Details
| Brand | Lucas Oil |
|---|---|
| Compatible with Vehicle Type | Car |
| Container Type | Bottle |
| Included Components | Lucas Oil Fuel Treatment |
| Manufacturer | Lucas Oil |
| Part Number | 10013 |
| Manufacturer Warranty Description | 30 Days |
Additional Product Information
| Model Number | LUC10013 |
|---|---|
| Size | 128 Fluid Ounce |
Pros
- Cleans and lubricates the fuel system
- Improves fuel economy and increases MPG
- Increases power and acceleration
- Neutralizes harmful contaminants
Cons
- Contains chemicals known to the State of California to cause cancer and reproductive harm
Recommended for owners of both gasoline and diesel vehicles looking for a comprehensive fuel system cleaner and performance enhancer. Its large 1-gallon size makes it economical for frequent use across multiple vehicles.
6. Hot Shot’s Secret Diesel Extreme, 16 oz, Fuel System Cleaner
Best for: Intensive diesel fuel system cleaner.
This 16 oz fuel system cleaner works through your entire diesel system to remove harmful deposits, water, and sludge. It improves cetane for smoother, more efficient combustion, resulting in easier starts, stronger acceleration, and reduced emissions.
Diesel Extreme's premium formula contains cumene to enhance fuel quality and combustion efficiency, leading to performance benefits like easier starts and reduced emissions. It effectively removes deposits, water, and sludge from the entire fuel system. The 16 oz bottle provides a concentrated treatment for optimal engine performance and efficiency.
Product Details
| Brand | Hot Shot's Secret |
|---|---|
| Container Type | Bottle |
| Included Components | Diesel Extreme Fuel Additive 16 Oz Bottle |
| Item Form | Liquid |
| Item Volume | 473 ml |
| Item Weight | 0.45 kg |
| Manufacturer | Hot Shot's Secret |
Additional Product Information
| Material Features | Fragrance Free |
|---|---|
| Model Number | DIESELEXT16 |
| Size | 16 Fl Oz (Pack of 1) |
| Special Features | Not_Performance_Used |
| Warranty Description | 1 Year Limited |
| Additional Information | Important information |
Pros
- Removes harmful deposits, water, and sludge
- Improves cetane for smoother combustion
- Results in easier starts and stronger acceleration
- Reduces emissions
Cons
- Requires a single, intensive application rather than daily use
Ideal for diesel owners needing a deep clean of their fuel system to address performance issues. Best used as a periodic treatment to remove accumulated contaminants and restore optimal engine function.
7. Liqui Moly Super Diesel Additive | 300 ml | Diesel additive | SKU: 2002
Best for: Diesel fuel system cleaner and lubricant.
This diesel additive cleans and maintains the fuel system, preventing corrosion and increasing lubrication to reduce wear on fuel pumps and injectors. It boosts cetane value for improved engine performance, easier starting, and lower emissions.
The formula increases the cetane value, leading to improved engine performance, easier starting, and reduced emissions. It provides enhanced lubrication, which directly reduces wear on fuel pumps and injectors, while also preventing corrosion within the system. Regular use ensures the diesel fuel system remains in perfect working order.
Product Details
| Brand | Liqui Moly |
|---|---|
| Item Weight | 6.4 ounces |
| Item model number | 2002 |
| Manufacturer | Liqui Moly |
| Part Number | 2002 |
| Model | 2002 |
| Dimensions | 5.8 x 3.2 x 3 inches |
Additional Product Information
| Voltage | 12 volts |
|---|---|
| Additional Information | Important Information Proposition 65 Warning for California Consumers WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov |
Pros
- Cleans and maintains the diesel fuel system
- Prevents corrosion and increases lubrication
- Reduces fuel pump and injector wear
- Increases cetane value for improved performance
Cons
- Contains chemicals known to the State of California to cause cancer and reproductive harm
Suitable for diesel vehicle owners committed to regular fuel system maintenance and wear reduction. It is particularly beneficial for those seeking improved engine response, easier starts, and lower emissions through consistent application.
8. 4 Bottles of Stanadyne 38564 Performance Formula 8 oz Diesel Fuel Additive
Best for: Performance diesel fuel additive.
This performance formula enhances engine performance and horsepower while providing cold weather and anti-gel protection. It improves fuel economy, lubricates, cleans, and protects against corrosion, while being safe for exhaust aftertreatment systems and compatible with ULSD and B20 blends.
The detergency and cetane improver in this formula help restore fuel economy, increase horsepower, and torque by cleaning deposits in the injectors. It offers lubrication and corrosion prevention, ensuring protection for fuel system components. Its compatibility with ULSD and B20, along with exhaust aftertreatment safety, makes it versatile.
Product Details
| Brand | Stanadyne |
|---|---|
| Item Weight | 0.01 ounces |
| Manufacturer | Stanadyne |
| Part Number | 24349 |
| Dimensions | 13 x 11 x 2 inches |
Pros
- Improves performance and horsepower
- Provides cold weather and anti-gel protection
- Restores fuel economy
- Safe for exhaust aftertreatment systems
Cons
- Comes in an 8 oz bottle, requiring multiple units for larger tanks or frequent use
Recommended for diesel owners seeking enhanced engine performance, fuel economy, and cold-weather protection. It's a good option for those with modern emission systems who need a reliable, all-around performance boost.
9. Opti-Lube XPD All-Season Diesel Fuel Additive – Gallon (1 Gallon (Treats 512 Gallons))
Best for: All-season diesel fuel additive.
This all-season diesel fuel additive is formulated to improve truck performance year-round, whether during rain, snow, or shine. It enhances fuel mileage, providing more value, and helps separate water from the fuel system.
The XPD formula is designed to enhance fuel mileage year-round, offering better value and keeping your diesel running at its best. It works to improve the performance of your truck in various weather conditions and actively helps to separate water, preventing potential issues. This gallon-sized container treats up to 512 gallons.
Product Details
| Brand | Opti-Lube |
|---|---|
| Item Weight | 7.73 pounds |
| Item model number | OPT-XPD1-NA |
| Manufacturer | Opti-Lube |
| Part Number | OPT-XPD1-NA |
| Dimensions | 7 x 4.5 x 10 inches |
| Voltage | 12 volts |
Additional Product Information
| Additional Information | Important information |
|---|
Pros
- Improves performance year-round
- Enhances fuel mileage
- Helps separate water from fuel
- Treats up to 512 gallons
Cons
- Effectiveness may depend on base fuel quality and blend
Ideal for diesel owners who operate in diverse weather conditions and seek consistent fuel mileage and performance improvements. It's a practical choice for those who want year-round protection and efficiency from their fuel additive.
10. STA-BIL Diesel Fuel Stabilizer, 32 oz
Best for: Diesel fuel stabilizer and cleaner.
This diesel fuel stabilizer is designed to keep diesel fuel fresh for up to 12 months, preventing sludge and sediment formation. It also cleans and lubricates the entire fuel system, protecting against corrosion and reducing oxidation.
The advanced formula acts as a shield against sludge and sediment, ensuring a cleaner, more efficient engine. It cleans and lubricates the entire fuel system, from fuel filters to injectors, and protects against corrosion. This 32 oz bottle treats up to 320 gallons, making it suitable for long-term fuel storage and regular use.
Product Details
| Brand | STA-BIL |
|---|---|
| Container Type | container |
| Included Components | Unit^Instruction Guide |
| Item Form | Liquid |
| Item Volume | 946 ml |
| Item Weight | 900 g |
| Manufacturer | Gold Eagle Co. |
Additional Product Information
| Material Feature | Unscented |
|---|---|
| Material Features | Unscented |
| Model Number | 22254 |
| Recommended Uses | Dog_toy |
| Size | 1 Count (Pack of 1) |
| Special Features | Clean & lubricate entire fuel system, Made in the U. S. A., Prevent sludge and sediment formation, Protect against corrosion, Reduces oxidation of diesel fuel caused by thermal breakdown |
| Warranty Description | 1 year manufacturer |
Pros
- Prevents sludge and sediment formation
- Keeps fuel fresh for up to 12 months
- Cleans and lubricates the fuel system
- Protects against corrosion
Cons
- Does not explicitly mention cetane boosting or lubricity improvement
Best for diesel owners who need to store fuel for extended periods or want to maintain a clean, well-lubricated fuel system. It is recommended for preventing degradation and ensuring easy starts after storage.
What Buyers Often Overlook
Treatment capacity and dosing fit
Treatment capacity is the clearest practical difference among these diesel additives. Smaller containers include 300 ml, 8 oz, 12 oz, and 16 oz formats, which can suit targeted cleaning, occasional treatment, or owners who prefer a compact bottle. Larger formats are designed for repeated use: one option treats up to 400 gallons, another up to 512 gallons, and the 32 oz stabilizer treats up to 320 gallons.
The two-step kit separates a deep clean from ongoing maintenance: its 12 oz cleaner treats 30–40 gallons, while the accompanying 40 oz treatment covers up to 400 gallons. Match the stated treatment volume to your tank and refill pattern, and do not assume that a larger bottle is automatically better.
A product with explicit dosing guidance is easier to use consistently; STA-BIL, for example, lists different ratios for in-season use and storage and warns not to overtreat.
The Key Product Trade-Off
Formula fit for fuel-system and storage needs
Formula fit depends on whether you are maintaining fuel, addressing deposits, protecting components, or preparing diesel for storage. Everyday products emphasize ongoing performance, while dedicated cleaners focus on deposits, water, sludge, injector response, or fuel-system restoration. Several formulas add lubricity support, which is relevant to pumps and injectors, and multiple products increase cetane for easier starting or smoother combustion.
Compatibility also varies by stated use: some products are listed for all diesel engines, including modern high-pressure common-rail systems, while others specify ULSD, biodiesel, or B20 compatibility. For seasonal operation, one option offers cold-weather and anti-gel protection, while the stabilizer is designed to keep fuel fresh for up to 12 months and reduce oxidation, sludge, sediment, and corrosion.
Choose by the failure mode you want to address rather than stacking products without checking their labels.
Best Additive For Diesel Engines: Buyer's Guide
Fit, Dimensions, and Compatibility
Compare the listed dimensions with the intended counter, cabinet, appliance, storage, or installation space. Confirm model compatibility and connection requirements where they are supplied. A useful feature cannot compensate for a product that does not physically fit or work with the buyer’s existing setup.
Capacity, Output, and Operating Format
Match listed capacity, volume, output, and operating mode to the actual household or work routine. Larger figures can support heavier use, while a smaller format may be easier to place and maintain. Treat daily output, immediate storage, and container capacity as separate specifications when the listing distinguishes them.
Materials, Construction, and Care
Use the listed materials and care instructions to judge cleaning effort, storage conditions, and compatibility with the intended use. Dishwasher, freezer, food-contact, or weather-related claims are included only when supplied for that product. Check whether routine care fits the way the product will be used.
Included Components and Setup Needs
Review the included components before planning installation or first use. Hoses, adapters, lids, paddles, bowls, brushes, controls, and manuals vary by listing. Confirm power, water, assembly, or accessory requirements from the supplied product information rather than assuming that separately pictured parts are included.
Which Should You Choose?
Choose an everyday maintenance formula if you want routine treatment with cetane support and a compact bottle. Select a dedicated fuel-system cleaner when deposits, water, sludge, hard starting, or weak acceleration are the main concern. A two-step kit suits buyers who want an initial deep clean followed by treatment at every fill-up.
For frequent fueling or larger equipment, prioritize clearly stated high capacity, such as 400 or 512 gallons. If your diesel sits between uses, choose a stabilizer with storage directions and fuel-freshness claims.
Drivers operating in colder conditions can consider the option listing anti-gel protection. Owners of modern common-rail systems should favor products that explicitly state compatibility, and anyone using ULSD, biodiesel, or blends should verify the listed fuel coverage before dosing.
Quick Buying Checklist
- Confirm the complete dimensions against the available space.
- Verify model, accessory, connection, and appliance compatibility.
- Match capacity or output to the expected amount of use.
- Compare materials and care instructions with the maintenance routine.
- Check the included components before planning setup or first use.
- Confirm listed power, water, storage, or installation requirements where applicable.
Frequently Asked Questions
How often should I use a diesel additive?
Usage frequency varies by product and your driving conditions. Some are designed for daily use, while others are for periodic deep cleaning. Check the product label for specific recommendations, but generally, a treatment every few thousand miles or during oil changes is common for maintenance.
Can diesel additives improve fuel economy?
Yes, many diesel additives can improve fuel economy. By cleaning injectors, improving combustion, and boosting cetane levels, these additives help the engine run more efficiently. This can lead to a noticeable increase in miles per gallon over time, especially with consistent use.
Are diesel fuel additives safe for my engine?
Generally, yes. Reputable diesel additives are formulated to be safe for all diesel engine components when used as directed. They are designed to clean and protect, not harm.
Always follow the manufacturer’s instructions to avoid potential issues.
What is cetane boost and why is it important?
Cetane boost refers to an additive that increases the cetane number of diesel fuel. A higher cetane number means the fuel ignites more readily and burns more completely. This results in smoother engine operation, reduced noise, easier cold starts, and potentially better power.
Can I mix different diesel additives?
It’s generally not recommended to mix different diesel additives without consulting the manufacturers. While some might be compatible, others could react negatively, potentially reducing their effectiveness or causing harm to your fuel system. Stick to one product at a time.
Final Words
Choosing the best diesel additive depends on your specific needs, whether it’s daily maintenance, deep cleaning, or performance enhancement. For general use and improved fuel economy, options like Lucas Oil or Power Service are solid choices. For more intensive cleaning and protection, Archoil or Hot Shot’s Secret offer robust solutions.
Always follow product instructions for optimal results.
