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 fuel additive for diesel owners, developed to maximize engine performance at every fill-up. Simply pour, fill and drive to boost power, improve MPG, increase lubricity and maintain a clean fuel system.

  • Boosts cetane up to 8 points
  • Improves combustion efficiency
  • Increases fuel economy
  • Lubricates and protects the fuel system
  • Cleans injectors, turbo and DPF (reduces regens)
  • Reduces maintenance and extends 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 $198 in fuel costs per 40.6 oz bottle (based on average fuel prices, September 2022).

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

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. In ASTM testing, AR6500 increased diesel lubricity by 43%.

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 AR6500 Diesel Treatment 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.

We are so confident that AR6500 Diesel Treatment will benefit your vehicle that we offer a Money Back Guarantee on any single bottle order.


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 $198 per 40.6 oz bottle of AR6500 (based on 10% MPG increase and average fuel prices September 2022).

Improve Fuel Lubricity

AR6500 improves the lubricity of diesel fuel. Lack of lubrication can cause a variety of issues in the diesel world, 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 and resulting in:

• Excessive wear

• Premature failure

• Costly repairs

The Engine Manufacturer's Association recommends using fuel to a maximum wear scar of 460 microns in order to meet the needs of a vehicle.

In wear scar testing (ASTM D6079), base diesel fuel produced a scar width of 614.5 microns. The same fuel treated with AR6500 Diesel Treatment produced a scar width of 347.5 microns - a 43% increase in lubricity. Improving lubricity extends component life and prevents premature failure.

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 deposits from injectors 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.



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 89 reviews
Gary B. (Buckhannon, WV, US)
I was skeptical…

I was skeptical about the claims of Archoil but with the first application I was sold. I have a 2011 F-250 6.7. I used the high dose as recommended for the first application and before the tank was empty I had a remarkable difference.
I had been using Dxxxxl Klxxn to increase cetane due to inconsistency in fuel. It had given me some improvement but not like Archoil.

I had some turbo lag - Gone
Engine had rough idle at times - Gone
Fuel economy has increased between 1 and 1.5 MPG depending upon how hard I push.

I’m sold. Will keep a supply on hand.

A (Richland, WA, US)
Good product

Stuff works like it should and does what it supposed to do I would buy again

Chris K. (Saltillo, MS, US)
Good product

So far so good

Douglas L. (Georgetown, TX, US)
Good stuff

Been using it for 3 years in my 7.3 fords all good.

David W. (Panama City, FL, US)
Awesome fuel treatment

This is exactly what I needed for my EcoDiesel Runs better then ever

"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