Best Diesel Additives (2026 Guide)
We ranked products by average rating and review volume, then verified feature tags (cetane boost, fuel-system cleaning, stabilizer, anti-gel) to ensure category coverage
The Verdict
- Best Overall: Archoil AR6500 Diesel Treatment (40 oz) for diesel engines — Best for balanced improvement: adds cetane boost and cleaner fuel combustion for smoother running and economy gains
- Best Value: Stanadyne Diesel Performance Formula 64 oz — Best for fuel-system cleaning: designed to remove deposits and restore injector and pump performance for smoother operation
This guide covers top-rated diesel additives selected for measurable benefits like fuel-system cleaning, cetane boosting, anti-gel protection and fuel stabilization. Picks were chosen by combining average star ratings with review volume and product features to highlight broadly recommended options across common diesel needs
Top Picks
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1
Best Overall Archoil AR6500 Diesel Treatment (40 oz) for diesel engines
Best for balanced improvement: adds cetane boost and cleaner fuel combustion for smoother running and economy gains
Diesel additive that cleans post-combustion system and boosts cetane, aiding fuel economy. Customers report improved mpg and smoother engines
- post-combustion clean capability
- cetane boost and power
- large-tour bottle treats many gallons
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2
Best Value Stanadyne Diesel Performance Formula 64 oz
Best for fuel-system cleaning: designed to remove deposits and restore injector and pump performance for smoother operation
Diesel fuel additive designed to improve engine smoothness and fuel injector cleanliness. Customers report better mileage and quieter operation after use
- OEM compatibility
- injector cleanliness
- engine smoothness
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3
Archoil AR6500 Diesel Treatment Four Pack
pack: delivers the same cetane boost and fuel-system cleaning in a multi-pack for frequent use
Diesel fuel additive with combustion modifier tech and cetane boost. Clean, lubricate, and protect fuel systems, including HPCR engines; customers report improved fuel efficiency and smoother operation
- four-pack value
- cetane boost and cleaning action
- supports HPCR systems
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4
Pri-G Gasoline Treatment 32 oz
Best for gasoline users needing stabilization: restores old fuel and controls engine debris to maintain driveability
Pri-G Gasoline Treatment enhances ignition quality and protects the fuel system, with long-term storage benefits. Customers note it preserves old fuel and keeps motorhome fuel fresh, usable for 1–2 years
- fuel stabilizer for long-term storage
- improves ignition quality
- restores freshness of degraded fuel
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5
Archoil AR6500 Diesel Treatment (40 oz) 2-pack
Best two-pack option: provides repeated treatments focused on cetane improvement and fuel-system cleanliness
Diesel fuel additive duo designed to address modern Diesel fuels with combustion modifier tech and cetane boost. Helps clean, lubricate, and protect fuel systems, including HPCR. Customers report improved fuel efficiency and smoother engine performance
- 2x AR6500 treatment
- treats up to 800 gallons
- cetane boost and combustion modifier
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6
Diesel Winter Anti-Gel Fuel Treatment 5 Pack
Best for winterizing: formulated to prevent diesel gelling and improve low-temperature flow in cold climates
Diesel anti-gel additive to prevent gelling and improve cold starts. Helps cetane boost and protect fuel system in cold weather, with easy measurement and use, per customer feedback
- Prevents wax crystallization
- Enhances cold-start performance
- Cetane boost up to 7 points
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7
Diesel fuel stabilizer and performance improver (1 gal) STA-BIL
Best for long-term storage: gallon stabilizer that protects diesel during extended layup and reduces varnish formation
Diesel fuel additive that stabilizes fuel for up to 12 months, lubricates and cleans the fuel system. Customers report improved engine performance and protection against sludge and sediment
- Prevents sludge and sediment
- Cleans and lubricates fuel system
- Keeps fuel fresh for up to 12 months
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8
Everyday Diesel Treatment 6-in-1 additive
Best all-in-one routine treatment: combines injector cleaning, fuel-system cleaning and a cetane boost for regular maintenance
Diesel additive designed to clean fuel system and improve performance. Boosts cetane and fuel economy; cleans injectors and improves lubricity. Customer insight notes improved performance and fuel mileage with occasional cap leakage concerns
- 6-in-1 diesel additive
- injector and fuel-system cleaner
- cetane boost and lubricity improvement
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9
Meaner Power Diesel Kleaner with IDX4 Detergent (2x32oz)
Best for injector-focused cleaning: includes IDX4 detergent to tackle injector deposits while improving lubricity
Diesel fuel additive with IDX4 detergent to clean, stabilize and lubricate ULSD. Improves combustion and injector protection, with noted fuel efficiency and cold-weather performance insights
- IDX4 detergent for maximal cleaning
- protects injectors with lubricity
- stabilizes stored diesel fuel
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10
Stanadyne Diesel Fuel Additive 2 Pack (38566) - performance formula
Best performance formula pair: targets fuel efficiency and engine performance with a focus on cetane improvement
Diesel fuel additive that improves combustion, reduces wear and emissions, and enhances mpg. Customers note easier starting and smoother idling with improved engine performance
- claims mpg improvement
- reduces wear and lubricity loss
- emission and smoke reduction