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

AR6500 Diesel Treatment

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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 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.

On average, AR6500 users experience an MPG increase of up to 10%, representing a saving of up to $213 in fuel costs per 40.6 oz bottle (based on average fuel prices, November 2022).

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

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.

Standard: 1 oz (30ml) of AR650 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.


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.

The higher the cetane number (CN) of fuel, the faster the fuel ignites which produces a complete and cleaner fuel burn. Your vehicle typically requires a CN of 47-50 in order to run as intended by the manufacturer but the vast majority of the US is being served by diesel with a CN of 40-45.

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 $213 per 40.6 oz bottle of AR6500 (based on 10% MPG increase and average fuel prices November 2022).

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 component life 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.

Test Results 📈

Understanding why fuel system components begin to fail is key to restoring and maximizing fuel system performance. Read the Data Sheet for test results and more information on how AR6500 works.
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 111 reviews
Johnathon M. (Milwaukee, WI, US)
So far great

Out of all the additives I've tried. I like this one the most

Kyle (Pawleys Island, SC, US)
Can see a difference

I’ve only used it a couple times but I can see a difference in the turbo lag. I tow a job trailer daily and it definitely seems that it has better pickup and go. Not sure about fuel but I don’t usually check it being it worked everyday.

DTP5050 (Phoenix, AZ, US)

I use the AR6500 in every tank of fuel. I drive in hill country and this benifits me.

charles l. (Winter Haven, FL, US)
Great product

Use this in every fill up on my 35 year old Toyota diesel.. Starts with little smoke and runs quiet and smooth .. best product I have used for my diesel ..

"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