Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now

AR6500 Diesel Treatment

Improves Everyday Diesel Quality & Combustion Efficiency

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.

Features & Benefits

  • Increases Power and Response
  • Improves MPG 6-10%
  • Reduces DPF Regen Frequency
  • Dissolves Sludge and Stabilizes Fuel
  • Improves Lubricity and Extends Component Life
  • Maintains and Protects Injectors and Fuel System
  • Disperses Water and Protects Against Corrosion
  • Boosts Cetane up to 8 points
Cetane Number

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.

How it Works

More complete fuel burn

AR6500 will ensure correct injector spray patterns and a more complete fuel burn which improves fuel efficiency, power and response. A more complete fuel burn also means less soot/carbon emissions are produced which keeps the engine, turbo, and emissions systems (EGR, DPF etc.) free from soot deposits.

Keeps diesel particulate filter clean

Due to reduced soot emissions, vehicles equipped with a Diesel Particulate Filter (DPF) will benefit from reduced frequency and length of DPF regeneration, which results in big fuel efficiency gains. When the DPF captures less soot, much less fuel is needed to burn it off, and there is less exhaust backpressure which reduces engine efficiency.

Protects fuel system

Detergents will keep your fuel system clean preventing the formation of power/economy robbing deposits and a lubricity improver will prevent wear in all fuel systems including the most modern high pressure fuel systems. AR6500 will also combat corrosion as well as disperse water and keep fuel filters clean.

Fuel stability and system protection

AR6500 will maintain fuel stability by preventing fuel from degrading and forming sludge and varnish which does not burn readily and can plug fuel filters and injectors if left untreated. A powerful dispersant will dissolve sludge and varnish allowing it to pass through your fuel system and burn completely.

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

Customer Reviews

The Best Product I Have Ever Used
2010 Mercedes GL350

Upon application of product, engine ran noticeably quieter and smoother within a few miles. MPG increased significantly (added over 100 miles of range during highway driving) power seemed to improve after the 2nd tank possibly due to a cleaner turbo and/or EGR. Once I ran out the tank with the 6500, fuel economy dropped although it was better than prior to using it. Overall performance was better (smoother, quieter, more responsive). There is clearly something in the additive that helps improve the combustion of the fuel therefore adding to a more efficient combustion. Regardless, this is the best product I have ever used.

AR6500 Cleared The Code
6.7L Power Stroke

Just before I tried AR6500, my engine threw a code. It was for the number 3 injector saying it was dirty/failing. After receiving and using AR6500 things got better. I put my first dose in and ran the truck for a couple of days. I had cleared my code just prior to the dose and it had come back on. After the couple of days running the truck with AR6500 I cleared the code again. It has not returned. By the third fill up the engine seem to be running smoother. The code has still NOT returned. My regen cycles have also decreased. My truck's MPG has also increased. Before I averaged around 12mpg, now I average around 14mpg. As I mentioned before the truck really seems to run smoother.

Brought My 7.3L Back To Life. I'm A Believer!
2002 7.3L Power Stroke

Since I use AR6200 Fuel Treatment religiously and have for the last 55,000 miles plus, I did not expected any significant change... boy was I surprised!

The engine noise became noticeably quieter after about 20 to 30 miles of driving. No smoke out of exhaust. In addition there is a slight improvement in acceleration. Before any Archoil products this truck was lucky to get 14.0 MPG on the highway at 70 mph (my normal highway driving speed). I just drove back from New Mexico with a slight tailwind and AR6500... one leg I got 20 MPG!! This truck in 60,000 miles has NEVER gotten 20 MPG before!

AR6500 is a wonderful product that helped bring my sluggish and tired 7.3L diesel back to life! I'm a believer in this new product.

Increased Power and Improved Acceleration
2007 Duramax

I had fuel injector issues. The engine had an EGR problem. Turbo lagged, not the best performance or MPG.

After AR6500, the engine runs smoother, better performance. MPG increased by 3 MPG. No heavy black exhaust when at full open throttle. Turbo runs cooler. Faster engine warm up. Clean exhaust. Better performance when towing or hauling heavy items. Engine is not as loud as it used to be.

The Diesel Fuel System Kit

For the best and most rapid results, use AR6400-D Diesel Fuel System Cleaner before AR6500 Diesel Treatment.

MSRP: $72.90

Sale: $53.95

You Save: $18.95 (26%)

Buy Now

AR6200 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 33 oz bottle of AR6500 treats up to 330 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 10 reviews
I think it saved my 2015 Superduty!!!

My 2015 F350 Superduty was chronically in regen. It never could clean itself out, despite hundreds of highway miles, driving in tow/haul, and manually driving it in lower gears.
It was getting so bad, losing power when towing, that I installed an SnB cold air intake. Didn’t help the regen issues. However, my dealer insisted I reinstall the stock air box for them to do a manual regen and reflash the ECU!
2015 is out of warranty now. A month ago I was considering taking the financial gut punch and trading it in on a new truck.
I then found Archoil!!!
I bought the 3 part system of Archoil.
Within half a tank of the diesel injector cleaner, the truck began to wake up and run stronger.
Now I’m on my second tank of AR6500 fuel treatment. The truck is like new! Running stronger, smoother, and quieter than it has in over a year.
Can’t wait to add the oil additive at my next oil change.
Couldn’t be happier and thankful to have found this product.
To keep my 2015, the cost of Archoil is a fraction of a new diesel truck.
I gained just over a mile per gallon as well!
Thank you Archoil!
Customer for life here.


Excellent products

Good goopity goo

I have a 6.0 Powerstroke which are known for issues with injectors. I used to run both the AR6200 and AR9100 all the time (to prevent future problems) and never noticed a difference in performance. I’m certain the AR6200 was a huge benefit still for the life of my injectors and it did seem to run a little smoother. Decided to try this out since it’s geared more towards diesel. For my 20 gal tank, I used the maximum amount recommended. After a couple fill-ups, I do notice a difference. It actually seems equally smooth as when running thr AR6200 but now it seems to have more pep. I’m not saying it’s a huge difference, but just enough to be noticeable. I’m also not sure how this affects my MPG since I do a lot of mixed driving and towing. My only negative thing was the bottle design, it’s bigger and bulkier and the bottle neck doesn’t have the flexible hose like the AR6200. I had to be more cautious not to spill it or put too much by mistake when pouring it in. My second fill-up I did exactly that and the bottle slipped out of tank fill hole for a second since it barely reached. For this I deducted 1 star. Very pleased otherwise.


works great in my 7.3 or my 6.0


Haven't used the product yet, however was very pleased with the prompt shipping. I have been using archoil for several years in my powerstroke 6.0liter can attest to how the engine starts and runs very well after installing the archoil products, even in cold winter weather.