Best Diesel Fuel Additive for 6.0 Powerstroke (2026): 5 Picks Compared

A Powerstroke diesel is a thirsty, hard-working engine, and the fuel it drinks decides how clean its injectors stay and how it starts on a cold morning. A diesel fuel additive is the small bottle that goes in the tank at fill-up, and the listings here promise cleaner injectors, better lubricity, more cetane and fuel that keeps flowing when the temperature drops. This guide compares the best diesel fuel additive for 6.0 powerstroke picks on the figures each listing states: treatment gallons, cetane, anti-gel and what the listing leaves out.

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Picks for the garage

#	Product	Shop Score	Buy
1	Opti-Lube XPD All-Season Diesel Fuel Additive	9.7/10	Buy on Amazon
2	Archoil AR6500 Diesel Treatment (10.1 oz)	9.7/10	Buy on Amazon
3	Hot Shot's Secret Diesel Extreme 32 oz	9.7/10	Buy on Amazon
4	Opti-Lube XPD All-Season Diesel Fuel Additive	9.6/10	Buy on Amazon
5	Stanadyne Performance Formula Diesel Fuel Additive	9.6/10	Buy on Amazon

1

Opti-Lube XPD All-Season Diesel Fuel Additive

Opti-Lube·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A gallon of Opti-Lube XPD all-season diesel fuel additive that treats 512 gallons, with anti-gel down to -10°F, injector cleaning and water separation.

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Pros

• Treats 512 gallons from a single gallon, per the listing
• Anti-gel keeps fuel flowing down to -10°F
• Cleans injectors and helps prevent future build-up
• Demulsifier separates water from diesel fuel

Cons

• No cetane figure is stated
• No warranty term is stated
• Gallon size only, no small bottle stated in this listing
• The -10°F anti-gel figure carries an asterisk, with no note shown in the listing

2

Archoil AR6500 Diesel Treatment (10.1 oz)

Archoil·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A four-pack of 10.1 oz bottles that treats 400 gallons in total, with a cetane boost of up to 8 points, improved lubricity, injector cleaning and DPF support for all diesel vehicles.

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Pros

• Treats 400 gallons across four bottles, 100 gallons each
• Cetane boost of up to 8 points for faster ignition
• Lubricity improvement of 43 percent stated, naming the CP4 pump
• Cleans injectors and supports DPF care with fewer regenerations

Cons

• No warranty term is stated
• No safety certification or listing is stated
• Title lists 10.1 oz while bullets say 10 oz bottles
• No use rate per tank stated beyond the treat volume

3

Hot Shot's Secret Diesel Extreme 32 oz

Hot Shot's Secret·9.7/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 32 oz diesel fuel additive that treats 80 gallons, cleaning injectors and raising cetane, with a 1 year limited warranty.

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Pros

• Treats 80 gallons from a 32 oz bottle
• Flushes injector deposits, water and sludge
• Raises cetane for faster starts and smoother idling
• 1 year limited warranty

Cons

• Bullets and spec table give different bottle dimensions and weights
• Diesel only, not for gas engines
• No safety certification is stated
• Only the 32 oz size is listed

4

Opti-Lube XPD All-Season Diesel Fuel Additive

Opti-Lube·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 6-pack of 8 oz Opti-Lube XPD bottles that treat 32 gallons each, with cetane up to 3 points and anti-gel down to -10°F.

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Pros

• Each 8 oz bottle treats up to 32 gallons of diesel fuel
• Cetane improved by up to 3 points, per the listing
• Anti-gel support down to -10°F for winter driving
• Cleans injectors and helps reduce internal deposits

Cons

• Spec table lists NumberOfItems as 1 while the title and bullets say 6 bottles
• No warranty term is stated
• Anti-gel support depends on base fuel and environmental conditions, per the listing
• 8 oz bottles only, no gallon size in this listing

5

Stanadyne Performance Formula Diesel Fuel Additive

Stanadyne·9.6/10 Shop Score

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The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A pack of 6 pint bottles of Stanadyne Performance Formula diesel fuel additive, with detergents that clean deposits and a stated average of 4% improvement in MPG.

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Pros

• Detergents clean deposits in the injection system
• Listing states an average of 4% improvement in MPG and gains up to 9.6%
• Cetane improver for better starting and smooth running
• Lubricity improvers protect fuel system components

Cons

• No treatment gallons figure is stated
• No anti-gel temperature is stated
• No warranty term is stated
• Pint bottles only, no gallon size stated

Compared on paper

Every rating comes from the brand’s listing and is not a shop test (gathered 11 November 2026). Treatment is the gallons of diesel fuel the listing says one pack or bottle treats.

How the points were given

Each additive is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. A spec the listing does not publish scores nothing.

No score drops under 9.2 or climbs past 9.8; a tool’s place inside those bounds is set by its weighted point total. Only powered tools, or tools with stated safety features, get safety points. Everything else is rated out of 90.

What the listings tell you

This guide compares 5 diesel fuel additives. Only 3 give a treatment figure in gallons: the Opti-Lube gallon treats 512 gallons, the Archoil four pack treats 400 gallons, and the Hot Shot’s Secret bottle treats 80 gallons, while the Opti-Lube 6-pack states 32 gallons per bottle. The anti-gel temperature is stated on the Opti-Lube listings only, both down to -10°F, and the cetane figure is stated on the Opti-Lube 6-pack only, at up to 3 points, while the Stanadyne listing calls itself a cetane improver with no point figure.

Listings here carry contradictions between the title and the spec table. The Opti-Lube 6-pack spec table lists NumberOfItems as 1 while the title and bullets say 6 bottles, and the Stanadyne title lists part 385656 while the spec table lists 38565-6P. Trust the title and bullets on the bottle count, and check the part number with the seller before ordering.

No listing states a warranty term, and no listing states a safety certification, so every pick scores nothing for safety and warranty. The Archoil and Hot Shot’s Secret listings are title only, with no bullets and no spec table, so their figures come from the title alone.

Buying guide: choosing the best diesel fuel additive for 6.0 powerstroke

Treatment gallons

Treatment gallons decide how far one pack goes. The Opti-Lube gallon treats 512 gallons, the Archoil four pack treats 400 gallons, and the Hot Shot’s Secret bottle treats 80 gallons. The Opti-Lube 6-pack states 32 gallons per bottle, and the Stanadyne listing states no treatment figure at all, so compare the per-bottle figure with the pack figure before you buy.

Cetane and cleaning

Cetane and cleaning are the performance claims here. The Opti-Lube 6-pack improves cetane by up to 3 points, per the listing, and the Stanadyne listing calls itself a cetane improver with no point figure. For cleaning, the Opti-Lube gallon cleans injectors and helps prevent future build-up, and the Stanadyne detergents clean deposits in the injection system. The Archoil and Hot Shot’s Secret listings state no cetane or cleaning figure, since both are title only.

Anti-gel and cold flow

Anti-gel matters when the temperature drops. The Opti-Lube gallon and the Opti-Lube 6-pack both state anti-gel down to -10°F. The Stanadyne, Archoil and Hot Shot’s Secret listings state no anti-gel temperature, so check the listing before a cold snap.

How to use it

Add the additive at fill-up and follow the directions on the bottle, per the Opti-Lube 6-pack listing. The Opti-Lube gallon listing says the treatment rate is up to 512 gallons, and the Stanadyne listing gives no treatment figure, so the amount per fill comes from the bottle directions, not from this guide.

An engine flush is the companion job when deposits are the problem.

Garage Fit Check

• Space: the Opti-Lube gallon measures 7.0 x 4.5 x 10.0 inches, and the Stanadyne pack measures 11.0 x 9.0 x 6.0 inches, so both fit a shelf or a toolbox.
• Storage: keep the bottles upright and follow the directions on the bottle, per the Opti-Lube 6-pack listing.
• Power: no power is needed; these are pour-in additives, not equipment.
• Before the first job: check the part number with the seller, since the Stanadyne title and spec table list different part numbers, and count the bottles on arrival, since the Opti-Lube 6-pack spec table lists NumberOfItems as 1.
• Cold weather: only the Opti-Lube listings state anti-gel down to -10°F, so check the listing before a cold snap.

FAQ: garage tools

What is diesel fuel additive?

A diesel fuel additive is a liquid added to diesel fuel to improve lubricity, clean injectors, raise cetane or keep fuel flowing in cold weather. The listings here state lubricity, cetane, cleaning and anti-gel claims, with the figures in the compare table.

Does diesel fuel need additives?

The listings here do not state that diesel fuel needs additives. They state what each additive does: the Opti-Lube listings state lubricity for ultra-low-sulfur diesel, the Stanadyne listing states detergents that clean deposits, and the Archoil and Hot Shot’s Secret listings state no function beyond the title.

Does diesel fuel have additives?

The listings here do not state what is already in pump diesel fuel. They state what each bottle adds: lubricity, cetane, cleaning and anti-gel, per the Opti-Lube and Stanadyne listings.

Does diesel fuel additive work?

The listings state their own figures: the Stanadyne listing states an average of 4% improvement in MPG and gains up to 9.6%, the Opti-Lube 6-pack states cetane up to 3 points, and the Opti-Lube gallon states anti-gel down to -10°F. The Archoil and Hot Shot’s Secret listings state no figure, since both are title only.

Does diesel need fuel stabilizer?

The Opti-Lube gallon listing states that the additive more than doubles the storage life of standard diesel fuel, which is the stabilizer claim in this guide. No other listing here states a storage-life figure.

Related: the engine and shop equipment hub, our best fuel pump cleaner, and our best complete fuel system cleaner. Also see our best engine flush for high mileage car.