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

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.

Boost Cetane & Increase MPG

Boost Cetane Levels

AR6500 significantly increases the cetane rating of your diesel fuel, enhancing overall engine performance.

Improve Fuel Economy

With optimized combustion efficiency, AR6500 can improve your fuel economy, reducing the frequency of refueling and saving you money.

Save on Fuel Costs

By improving fuel economy, AR6500 helps you save up to $174 per 40.6 oz bottle (based on a 10% MPG increase and average fuel prices in January 2024)

Enhance Engine Response

The cetane boost provided by AR6500 leads to quicker and smoother engine response, making your driving experience more enjoyable.

Clean injectors to restore combustion efficiency

AR6500 contains highly concentrated detergents which remove internal diesel injector deposits (IDIDs) and carbon build-up from injector tips.

AR6500 cleans injectors to:

  • Improve fuel atomization
  • Produce a more complete combustion
  • Correct spray patterns
  • Reduce carbon deposits
  • Enhance 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
Improve Fuel Lubricity

AR6500 enhances the lubricity of diesel fuel, crucial for both older vehicles not designed for ultra-low sulfur diesel and newer vehicles with tighter tolerances. Lack of lubrication can lead to:

  • Excessive wear
  • Premature failure
  • Costly repairs

The Engine Manufacturer's Association (EMA) recommends a fuel wear scar no larger than 460 microns. U.S. diesel fuel (D-975) has a 520-micron standard, needing additional lubricity. AR6500-treated fuel reduces the scar width from 614.5 to 347.5 microns—a 43% increase in lubricity, extending the life of components like the CP4 pump and preventing premature failure.



Maximize results and save up to 22%

"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

Customer Reviews

Based on 424 reviews
Thomas J. (Owasso, OK, US)
Love it!

My 2016 RAM 2500 6.7l loves Archoil. I am on my second bottle and have 77K on the truck. Used the system cleaner first and within the first 10 miles noticed the engine was smoother and quieter. Used the first bottle of AR6500 and had another product at home so started using it. No-go. Engine got noisier almost immediately. Threw that away and got more Archoil. Quiet and smooth again. Went from 19.7 to about 22 MPG.

Craig V. (Los Angeles, CA, US)

Just finished a 2000 mile trip with our 5th wheel. Nice improvement in fuel economy.

Robert P. (Vernon, CT, US)

I run a 2002 7.3 work truck and a 2014 6.7,I have had great results in both vehicles,they run much better and increased fuel mileage on both,great product

Chris P. (Chesterton, IN, US)
Good stuff

My Ram is new so I decided to treat the fuel pretty much from day 1 . I think it’s cheap insurance

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.