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AR6500 Diesel Treatment

Improves Everyday Diesel Quality & Combustion Efficiency

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

Upgrade Your Diesel

Archoil's AR6500 Diesel Treatment has been formulated to address issues associated with modern diesel fuels. AR6500 incorporates the most powerful and advanced diesel additive chemistry that is currently available. Only 100% active ingredients are used with no fillers, offering greater value per fill up.

AR6500's detergents and lubricants have been engineered to clean, lubricate and protect your fuel system including injectors, pumps, lines and tank in all systems including the latest high pressure common-rail injection fuel systems.

AR6500 also incorporates Archoil's proven combustion modifier technology and a strong cetane boost to increase power and response and reduce soot and carbon build-up in turbos, DPF and EGR components.

AR6500 Features & Benefits

  • Improves Combustion Efficiency (Reduces Soot & Smoke)
  • Cleans Injectors, Turbo & DPF (Reduces Regens)
  • Lubricates & Protects Fuel System from Wear & Premature Failure
  • Reduces Maintenance Costs & Extends Component Life
  • Increases Fuel Economy (MPG) 6-10%
  • Compatible with all types of diesel fuel systems

Increase Cetane Up To 8 Points

Fuels having lower cetane ratings lead to poor fuel economy, less power and higher emissions. The common cetane rating at the pump is between 40-45 and the cetane your truck typically needs is between 47-50. By raising your fuel's cetane rating, MPG and power/response will be improved while emissions are reduced.

Protect, Maintain & Boost Your Vehicle's Performance


Clean injector deposits

AR6500 cleans and prevents injector deposits to restore lost horsepower and fuel economy. This extends engine life, corrects injector spray patterns and reduces exhaust emission while AR6500 works to prevent future build-up of soot.

Remove carbon from the turbo

AR6500 removes carbon from the key fuel system components, including the turbo, DPF and EGR. By restoring function to the fuel system, AR6500 keeps your vehicle working everyday to its full potential and prevents issues such as turbo lag and lack of boost.

Improve fuel lubricity

Protect your injectors, injection pumps and fuel system from wear by using AR6500 at every fill-up. Typically, diesel at the pump does not meet Engine Manufacturer's Association recommendation for lubricity. AR6500's chemistry improves fuel lubricity to above the recommended levels.

Increase fuel economy (MPG)

Use of AR6500 improves the poor quality of diesel at the pump, cleans and maintains fuel system components and revives engine performance. This, along with AR6500's cetane boost, improves fuel economy. In testing, AR6500 increased MPG by 11% in a 2011 Ford F-350.

Diesel Magazine

"You can add Diesel Tech magazine to the long list of testimonials as we're now believers in Archoil too.

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

Diesel Tech Magazine

AR6500 Frequently Asked Questions

What's the difference between AR6500 and AR6200 Fuel Treatment?

AR6500 Diesel Treatment has been formulated to address issues associated with modern diesel fuels, using advanced diesel additive chemistry to improve/fix issues directly related with diesel engines and fuel. AR6200 Fuel Treatment has been formulated to address issues associated with all fuels, using a strong universal additive package.

What's the difference between AR6500 and AR6400-D Diesel Fuel System Cleaner?

AR6500 is an everyday diesel additive with a small amount added to every tank of fuel to boost performance, ensure fuel quality and protect the fuel system from wear, deposit formation and corrosion. AR6400-D Diesel Fuel System cleaner is a powerful product designed to be added to remove all existing deposits from your fuel system and engine. For best vehicle performance use AR6400-D to clean your system, then use AR6500 to boost MPG, performance and protect your system at every fill-up. A 40 oz bottle of AR6500 treats up to 400 gallons of fuel and a 12 oz bottle of AR6400-D treats 40 gallons of fuel

Can AR6400-D be used in my vehicle?

AR6500 is suitable for all diesel vehicles, including newer systems such as High Pressure Common Rail.

Does AR6500 offer any anti-gel protection?

No AR6500 does not offer any anti-gel protection. Archoil AR6300 Winter Diesel Treatment does offer anti-gel protection.

What is the shelf life of AR6500?

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

Customer Reviews

Based on 63 reviews
Jim M. (San Jose, CA, US)
Seems to work as advertised, but way too expensive.

I have a one year old 2021 Chevrolet 3500HD with a 6.6 liter Duramax Diesel L5P Engine. It is bone stock and will stay that way (ie emissions intact). The truck currently has 16,000 miles on it and I started using the AR6500 at about 8,000 miles. The engine idles smoother and does fewer regenerations using the product. As far a fuel mileage is concerned, not a lot of difference as far as I can tell. The truck will get 18 to 21 mpg not towing on flat highway driving and 9-12 mpg towing a 12,000 fifth wheel camper depending on terrain. I believe this product works well but the price seems excessive, I would like to find a less expensive alternative. Diesel fuel is already too expensive and this additive make it worse.

anthony m. (Windsor, CA, US)

Using it for six months and notice the difference. Love the new bottle with the long neck which makes life easier.

Hunter B. (Broadway, NC, US)
Great Product!!!

Ive used Archoil for the past 9 years in my 6.0 Ford. It helps the truck start easier and less smoke and soot. The tail pipe is pretty clean considering. I can tell if I dont use the full treatment, it makes a huge difference. I use 1 oz / 10 gallons like it says on the bottle. I can see my EGT's increase if I go beyond the 1oz but it never gets out of hand. I recommended it to everyone I talk to that has a diesel. Truck has 150,000 with stock injectors and fuel system.

Vance C. (Houston, TX, US)

I am on my 4th. tank of fuel sense purchasing Archoil and my fuel mileage has increased by about 2 miles to the gallon. With the price of fuel increasing this helps make traveling better on a fixed income.

BILL H. (Big Bear, CA, US)
Love this stuff

I'm a diesel guy. This stuff really works.