Tired of sluggish performance, poor fuel economy and frequent regens?

Over time, every diesel vehicle experiences a gradual decrease in performance due to the high levels of pressure engine components are under. As these parts accumulate carbon deposits and experience friction-related wear, they become less efficient in their functioning, resulting in reduced power output and fuel efficiency. Gradual deterioration is inevitable in diesel engine operation but you can take action to keep your vehicle performing as it did the day it left the production line.

Use the most powerful combination on the market and unleash the power of your diesel

Experience the unrivaled performance of AR6400-D Diesel Fuel System Cleaner and AR6500 Diesel Treatment together in the Professional Diesel Fuel System Kit for the best results and the best value. Archoil's diesel treatments are highly-concentrated, contain our proprietary chemistry and work together to rapidly clean injector tips, the turbo and DPF. The Diesel Fuel System Kit lubricates and boosts fuel system performance to ensure maximum efficiency and power.

The only treatments to clean the entire fuel system

Unlike other diesel treatments, which may provide a cetane boost, injector cleaning or enhanced lubricity, Archoil's Diesel Fuel System Kit does all three PLUS removes carbon build-up from the post-combustion system.

AR6400-D's highly-concentrated, one-tank formula rapidly removes heavy build-up from the entire fuel system while AR6500 contains no fillers and utilizes Archoil's proprietary fluid technology to remove performance-robbing carbon from injectors, the turbo, DPF and EGR. The Diesel Fuel System Kit delivers a complete clean and boost package to protect your engine and maximize performance.

Boost cetane and increase MPG

Archoil's diesel treatments incorporate a strong cetane boost and our proven combustion modifier technology to increase power and response at every fill-up.

By increasing the cetane rating of diesel and cleaning the fuel system, combustion efficiency and fuel economy are improved. This means less stops at the gas station. saving you up to $172 per Diesel Fuel System Kit (based on 10% MPG increase, average fuel prices July 2023).

Diesel Fuel System Kit

Diesel Fuel System Kit

Regular price $69.90 Sale price$59.90 Save $10.00
  • Free U.S. shipping on orders over $40
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The Diesel Fuel System Kit includes:
  • Rapidly clean injector tips and IDIDs
  • Remove carbon and restore turbo function
  • Eliminate DPF build-up
  • Restore power and performance
  • Boost cetane up to 8 points
  • Increase fuel economy (MPG)
  • Lubricate and protect the fuel system
  • Maintain injectors, turbo and DPF (reduce regens)
  • Extend component life

Use AR6400-D at the first fill-up then use AR6500 at following fill-ups.

AR6400-D Diesel Fuel System Cleaner

• One 12 oz bottle of AR6400-D treats 40 gallons of diesel fuel. Use every 5,000 miles or as required.

AR6500 Diesel Treatment

• One 40.6 oz bottle treats 400 gallons of diesel

Standard: 1 oz (30ml) of AR6500 per 10 gallons of diesel.

Power Boost: 2 oz (60ml) per 10 gallons of diesel (boosts cetane up to 8 points).

Customer Reviews

Based on 655 reviews
Great stuff

Better diseal mileage, truck running better and smoother, I highly recommend

Donald M.M. (Denver, CO, US)
Very good product

Have to say it is very good few mileage went up. Truck runs 100% better very good product getting ready to order again.

Robert H. (Shepherdsville, KY, US)

Truck runs quite and smooth


Every oil change I add this to the fuel system. I’d like to think it’s cheap insurance for my engine. To me, it keeps the mpg’s up or down depending on my go pedal. Worth it in my opinion.


AR6400-D rapidly removes internal diesel injector deposits (IDIDs) and carbon build-up from injector tips. Benefits of clean injectors include:

  • Improved fuel atomization
  • Enhanced fuel efficiency
  • Extended engine life


Cleaning injectors results in correct injector spray patterns which ensures that fuel is finely atomized into tiny droplets.

This promotes a more complete and even combustion, leading to higher power output, smoother operation and reduced emissions.


AR6400-D removes soot and heavy carbon deposits from the DPF which reduces regen frequency, restores lost performance and prevents engine damage from a clogged DPF. Reduced DPF regens lead to:

  • Improved fuel efficiency
  • Improved power and responsiveness
  • Reduced maintenance costs

In testing, AR6400-D increased miles between regens 46%


AR6500 improves the lubricity of diesel fuel. Lack of lubrication can cause a variety of issues in both older vehicles which weren't built to run on ultra low sulfur diesel and new vehicles which are built with tighter tolerances. These issues include:

  • Excessive wear
  • Premature failure
  • Costly repairs

In ASTM wear scar testing, AR6500 Diesel Treatment increased the lubricity of fuel by 43%. Improving lubricity extends component life and prevents premature failure.


Carbon deposits on the turbo lead to:

  • Increased turbo lag
  • Decreased boost pressure
  • Overheating
  • Increased wear and potential damage
  • Reduced airflow

AR6500 clears the turbo of soot and carbon, reducing turbo lag and boosting throttle response. This reduces excess heat and wear, helping to avoid premature failure of the turbo.


Carbon deposits in the diesel particulate filter (DPF) create a backpressure, causing performance to suffer as exhaust flow is restricted.

AR6500 keeps the DPF free from heavy carbon deposits to:

  • Reduce regen frequency
  • Restore performance
  • Avoid engine damage by preventing a clogged DPF

"Seeing this F-350 run as smooth as it did the day it left the dealership definitely made believers out of us."

"Archoil is the Real Deal"
Diesel Power Magazine

"We are seeing great results using Archoil."

"I highly recommend Archoil products"
George Swift, Mechanic, Jay Leno's Garage

"Improved fuel economy, smoother running engine and no issues with cold starts."

"We're now believers in Archoil"
Diesel Tech Magazine

Archoil Diesel Treatment FAQs

AR6400-D and AR6500 are suitable for all diesel vehicles, including newer systems such as High Pressure Common Rail.

AR6500 will remain stable indefinitely if kept away from sources of heat and sunlight.

No, AR6300 Winter Diesel Treatment is the product you need for cold weather. AR6300 contains all the benefits of AR6500 plus anti-gel protection up to -44ºF.

Diesel Fuel System Kit

Diesel Fuel System Kit

Regular price $69.90 Sale price$59.90 Save $10.00
  • Free U.S. shipping on orders over $40
  • 100% Money Back Guarantee
  • In stock, ready to ship
  • Inventory on the way