AR6500 Diesel Treatment
AR6500 Diesel Treatment
AR6500 Diesel Treatment
AR6500 Diesel Treatment
AR6500 Diesel Treatment

AR6500 Diesel Treatment

Sale price$44.95
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AR6500 Diesel Treatment is the superior all-in-one diesel additive, developed to maximize engine performance. Increase diesel lubricity to protect your engine and improve fuel economy with a big cetane boost at every fill-up.



  • Boost cetane up to 8 points
  • Improve combustion efficiency
  • Increase fuel economy
  • Lubricate and protects the fuel system
  • Clean injectors, turbo and DPF (reduce regens)
  • Reduce maintenance and extend component life

The higher the cetane number of fuel, the faster the fuel ignites for a complete and cleaner burn.

The cetane rating of diesel at the pump is often between 40-45 and the cetane your vehicle typically needs is between 47-50. AR6500 improves the cetane rating of fuel which increases MPG, power and response while reducing emissions.

EPA regulations for fuel lubricity standards do not meet the Engine Manufacturer's Association recommendation which means fuel at the gas station is unlikely to meet the lubricity level your vehicle requires.

Lack of lubrication leads to excessive wear, premature failure and the potential for costly repairs.

AR6500 raises the lubricity of fuel to above the required standard, protecting your diesel engine. In ASTM testing, AR6500 increased diesel lubricity by 43%.

Read our blog on diesel lubricity

AR6500 cleans and maintains key fuel system components including injectors, pumps, lines and the tank.

The chemistry in AR6500 removes carbon deposits from injectors, turbos and DPFs, restoring lost horsepower and fuel economy.

For a more rapid cleaning of the fuel system to remove heavy carbon build-up, use AR6400-D Fuel System Cleaner before AR6500.

On average, AR6500 users experience an MPG increase of between 6-10%, representing a saving of up to $204 in fuel costs per 40.6 oz bottle (based on average fuel prices, January 2023).

In controlled highway testing, AR6500 increased MPG by 11.1% in a 2011 Ford F-350 over 1,600 miles.

Read our blog on how to save money on diesel

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

Power Boost: 2 oz (60ml) per 10 gallons of diesel. For best results use Power Boost dose in first tank of fuel.

Click here to read the AR6500 Data Sheet which includes test results and more information on how the product cleans your diesel fuel system.


The ONLY diesel treatment to restore the entire fuel system

AR6500 is the only product to deliver a complete clean and boost package to the entire fuel system and post-combustion system (turbo, DPF) to protect your engine, improve performance and maximize fuel economy.

Clean the DPF to reduce regens and avoid failure

Unlike other additives, AR6500 Diesel Treatment cleans carbon build-up from the diesel particulate filter (DPF). A clean DPF is essential for maintaining performance, reducing emissions and improving fuel efficiency.

AR6500 removes build-up and keeps the DPF free from heavy carbon deposits to:

  • Reduce regeneration frequency
  • Restore MPG & performance
  • Avoid engine damage by preventing a clogged DPF
Boost Cetane & Increase MPG

AR6500 incorporates a strong cetane boost and Archoil's proven combustion modifier technology to increase power and response at every fill-up.

By increasing the cetane rating of diesel alongside the cleaning properties of AR6500, combustion efficiency and fuel economy are improved which means less stops at the gas station, saving you up to $174 per 40.6 oz bottle of AR6500 (based on 10% MPG increase and average fuel prices January 2024).

Improve Fuel Lubricity

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, making a lack of lubricity potentially catastrophic. These issues include:

• Excessive wear

• Premature failure

• Costly repairs

The Engine Manufacturer's Association (EMA) recommends using fuel that produces a wear scar no larger than 460 microns to meet the needs of a vehicle. The diesel fuel specification in the United States (D-975) is only 520 microns, meaning additional lubricity must be added to meet the EMA recommendation - highlighting the importance of diesel fuel additives.

In wear scar testing (ASTM D6079), base diesel fuel produced an out-of-spec scar width of 614.5 microns. The same fuel treated with AR6500 produced a scar width of 347.5 microns - a 43% increase in lubricity. Improving lubricity extends the life of components, including the CP4, and prevents premature failure.

Read our blog on diesel lubricity

Clean Fuel System Components

Poor or incomplete combustion is one of the primary factors affecting the power and performance of your vehicle. As a result of low cetane fuel and a lack of detergents and lubricity, diesel fuel systems accumulate soot and carbon build-up in the key components including the injectors, turbo and DPF.

AR6500 contains the detergents, lubricity and cetane boost your vehicles requires to clean and maintain the fuel system.

Use of AR6500:

• Removes carbon injector deposits to restore spray patterns

• Prevents turbo lag and restores boost

• Reduces frequency of DPF regenerations

This easy, proactive maintenance of the fuel system restores lost horsepower and fuel economy and extends component life.

Remove Heavy Carbon Build-up

Vehicles with high mileage or symptoms of a restricted fuel system (including smoking, poor fuel economy, turbo lag and frequent regens) should be treated with Archoil AR6400-D Diesel Fuel System Cleaner first to speed up the process of cleaning the fuel system and remove heavier carbon deposits.

AR6400-D is a powerful, one-tank treatment developed to rapidly restore performance which rapidly cleans injectors, turbos and DPFs to remove performance-robbing carbon build-up.

The Diesel Fuel System Kit includes AR6400-D and AR6500 to maximize fuel system performance.



Maximize results and save up to 22%

AR6500 FAQs

AR6500 improves lubricity in fuel, cleans and maintains the fuel system and adds cetane for a boost that can be felt at every fill-up. AR6400-D is a highly concentrated one-tank fuel system cleaner to be used every 5,000 miles for rapid cleaning of heavy carbon build-up.

AR6500 is 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.

Customer Reviews

Based on 391 reviews
Anthony L. (Winchendon, MA, US)
No complaints

Been using since I purchased the truck so can’t comment on mpg but I can compare with my friends identical truck. And mine will regen less than his! As well as about .5 to .8 more mpg. Also my truck towing a rzr and travel trailer got the same mpg as just a travel trailer.
Wish the bottle was a little smaller and didn’t leak. Need to store it in bed.


I used this on our family vacation. I went thru both 40oz bottles. I didn’t see any increase in MPG nor did I notice a difference in the way the motor ran. I’m unable to see if it cleaned any of the internal parts of the motor, but I would not continue to spend $80 every month.


Been using every other tank and you can tell the way the diesel reacts each take. I fill up at the same two shell stations repeatedly to see the results.

Joseph R.
First time user.

So far so good, added to fuel and seams to help with horse power when pulling camper. We will see how goes after a few more tanks. 2020 GMC 6.6 duramax not my daily driver, but so far so good.

"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