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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

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 16 reviews
Why did you change the bottle?

Seems like your engineers could design a better system than a funnel & a sponge to soak up the excess. What was wrong with the old bottle? Maybe steel Sta-bil’s design.
Can’t be that difficult?

need new bottle

To early to tell but obviously you know you need to change the bottle since you sent a funnel. Other than that i expect this to be an excellent product based on your other products

Great Products

Very Good Products, Works great in my Truck!

Great product, terrible bottle!

Been using ar9100 and ar6200 for a few years and now switching to ar6500. Please use the same bottle as the 6200! The red funnel I get with the 6500 gets lost or full of dust when stored. I keep a bottle of 6200 and refill it with 6500 because the bottle is very user friendly.

Something that actually does what it's supposed to do.

This is the first review I have written about any product, but I feel that I am obligated to. I was skeptical about miracle additives. I've tried others like HOTSHOTS secrets (which caused my HPOP to leak badly, as well as a few other o-rings) So I was VERY hesitant to add any other miracle cures.

But I was having very tough cold starts, especially below 20 degrees. So it was kind of a hail Mary before new injectors. and to my surprise it actually helps a tremendous amount. It was noticeable after about 75 or so miles. This is the first time in 10 years my truck will start with only glow plugs, and I don't even have to cycle it multiple time like I used to. I can't say I notice any power differences, but the fact that it starts right up in the cold, and definitely knocks less are huge improvements for me. I do have to say I think the motor idles smoother and quieter. Also to boot, I accidentally bought local. The stuff is made a town over from me.

Anyways, thanks for having a product that actually does what it says.