The only treatment to clean, restore and boost the entire fuel system
AR6500 upgrades the quality of diesel fuel at every fill-up by providing a strong cetane boost, enhanced lubricity and a powerful detergent package.
AR6500 maintains clean injectors, and unlike other diesel additives, keeps your turbo and DPF free from carbon build-up.
Add at every fill-up to:
- Improve combustion efficiency
- Increase fuel economy
- Reduce DPF regeneration
- Protect the fuel system
- Extend component life
Boost cetane to increase power and response
Most diesel engines require fuel with a cetane number (CN) of 48-50 to operate efficiently but fuel in the US typically has a CN of 40-45. A low CN results in poor combustion, causing soot deposits and carbon build-up in key fuel system components.
AR6500's cetane boost of up to 8 points is greater than other products on the market, helping to:
- Improve combustion efficiency
- Enhance fuel economy
- Increase power and performance
- Extend component life
Improve lubricity to extend fuel system life
Lack of lubrication in diesel fuel is a major issue for both older and newer vehicles, leading to excessive wear, costly repairs and potential failure of components including injectors and pumps.
AR6500 has been independently tested to reduce wear by 43%, reducing friction and wear on the fuel system in order to:
- Protect engine components
- Reduce maintenance costs
- Improve engine reliability
- Extend component lifespan
Clean injectors and restore spray patterns
Over time, carbon deposits form on diesel injectors. Dirty injectors can’t spray fuel into the engine correctly, leading to incomplete combustion and wasted fuel.
AR6500 not only keeps injectors clean but by increasing cetane and improving combustion, helps prevent further build-up of deposits.
- Improve fuel atomization
- Reduce carbon deposits
- Enhance fuel economy
The only treatment to clean the DPF and reduce regens
Carbon build-up in the Diesel Particulate Filter (DPF) reduces engine performance, lowers fuel economy, and leads to increased regeneration frequency.
AR6500 utilizes proprietary chemistry to remove carbon build-up from the DPF, in order to:
- Reduce regeneration frequency
- Restore MPG & performance
- Prevent DPF-related engine damage
- Increase DPF lifespan
Prevent turbo failure and restore boost
A dirty turbo restricts airflow, leading to reduced engine efficiency, increased fuel consumption, and turbo lag. Carbon deposits can also cause overheating and potential failure, resulting in costly repairs.
AR6500’s proprietary chemistry survives combustion and uses exhaust heat to remove carbon build-up from the turbo, helping to:
- Reduce turbo lag
- Restore boost
- Minimize wear and damage
- Restore optimal temperature
- Improve airflow efficiency
Customer Reviews
Based on 791 reviews
87%
(690)
7%
(54)
3%
(26)
2%
(12)
1%
(9)
M
Good stuff but is showed up with leak in bottle. Guess that’s a shipping issue but lost about 20% of the contents. Have been using and seems to help.
L
I've been using this for a few months now and it is increasing the fuel milage. I alternate tanks with & without seams to help by 1-4 mpg. I thought when pulling the 5th wheel it would improve it better but it don't.I've tried 2oz and 4 oz to see if it made a difference. It also seems not to be going through as much DEF fluid🤷🏻♂️.
Over all it is pricey so it's either this or premium diesel at the pump.
F350 6.7 40 ft 5th wheel toy haul.
G
It's a new 2025 GMC Sierra AT4 1500. My last trip home from vacation. I got 37.2 to fuel economy. Truck only has 4k on it.
R
This is my first diesel vehicle. It's always been a desire to own a diesel with plans to use it to pull, tow, and carry loads. I retired and the first thing I did was buy the truck. Then the stock market did a hiccup with the President's strategy with the tariffs, so I slowed my spending to purchase intended camper, trailer etc...
To give an accurate review using ARCHOIL with very limited exposure to other additives is difficult. The reason I purchased archoil is I did advertised comparisons, reviews and studies that led me to purchase and try this additive. I have not yet worked the truck as it's designed to meaning, no towing. I only have 4000 miles on it all freeway miles. I will say this I've noticed a minimal increase in fuel mileage performance. 14 to 17 mpg. I believe there has only been 3 regens.
I wish the engineers would have allowed the owner to have record and indications on the dash of all regens. Why there is no notification of the function seems a bit short sighted.
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.
