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
Keeps the DPF clean and reduces regen frequency
Carbon build-up in the Diesel Particulate Filter (DPF) reduces engine performance, lowers fuel economy, and leads to increased regeneration frequency.
AR6500's proprietary chemistry cleans the system and will:
- 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.
By cleaning the system, AR6500 will:
- Reduce turbo lag
- Restore boost
- Minimize wear and damage
- Restore optimal temperature
- Improve airflow efficiency
Some of the reviews shown are from related products the merchant grouped with this one.
J
I have used this in every tank since my truck was new. I have 18,000 miles on it now. I do notice more miles between regens than others I talk to. I also get surprised looks at the mileage I am getting from such a big truck.
J
2500 miles pulling a 41 ft 5th wheel toy hauler with a 2017 Ram 2500. We went through Wyoming, Montana and Saskatchewan. Winds 30+ with 50 mph gust most of the way up. Some wind but not as bad on the way back. Without the wind we got 10 - 11 mpg. When the wind blew, always a cross or head wind, knocked down to 5-7 mph. Total trip average was 8.9. When running empty I'm averaging 20 mpg. I would hate to think how much worse it could have been without the AR6500. Ending up using most of the 40 oz bottle.
R
since i started using your diesel additive i have not been any happier any other alternatives I’m sold
D
I have used Archoil on my 2016 Ram Cummins for a long time. Now I have 2026 std 6.7 F350. ,9k on it 5500 k towing Runs very smooth and quite I have had to Dealer twice for oil change , my Service adviser has stated to me that your truck is the smoothest 6.7 I have heard He asked me what I did , I told him I run Archoil conditioner all the time , and when I tow I double the dose. Great product .
B
Truck runs great and I can only assume it's adding the needed lubricity to my diesel. I'll be a continuing customer.
D
I purchased my first diesel 12-5-2025 i was told by a family member whatever I do use a additive. I begin to research and use another brand first then switch to archoil and never looked back. Better mileage and the truck is alot quieter and preform better
M
I run Archoil 6500 in my 2024 F-250 High Output 6.7L diesel. The truck only has 17k miles but works hard—it's running big wheels, BFG KO3 tires, upgraded drilled/slotted disc brakes all around, and regularly pulls a 35-foot 5th wheel.
From the very first fill-up with the 6500, the engine felt significantly more responsive and lively. It definitely runs quieter, and my fuel economy has already improved. I'm not even halfway through my first bottle and I’ve already ordered a 2-pack. Highly recommend!
G
Bought another bottle of Diesel treatment for our trip from AZ to AK pulling my 36’ 5th wheel. F250 has run great all the way to Anchorage.
A
I’ve been running Archoil from the first tank of fuel in my new F-250 6.7 HO and I have been impressed. I have put right at 6000 miles on my truck so far and I’m averaging 21-22mpg I have seen it has high as 24 on a long highway trip with the cruise set at 75. Meanwhile my buddies aren’t running archoil are averaging 17-18. Seems to be working and I can’t say for sure since it’s a new truck but regens have been minimal and DEF seems to last longer than it did in my 2018.
A
This is the best product on the market for the job that it is performing thank you so much oil I'll be a continuing customer
R
At this time Arch oil is doing a great thing for my pickup truck and I'm enjoying it
J
Have used this on every fill up. Haven't noticed any difference in mileage or horsepower in my 2025 Ram cummins diesel
B
Ran this product to help clean injectors on Cummins engine on a Vermeer BC 1000xl. With in 15 minutes we saw the difference. The machine is definitely working as it should be. Vermeer dealer quoted $285 and hour and Cummins dealer quoted $450 and hour to diagnose. One bottle did the trick!!! I now use on all diesel truck and equipment.
S
I started using this when I bought my GMC AT4 3500, from the first tank I've had better milage than most that I know with similar trucks. At service intervals, oil filter looks great.
A
I’ve used this product since April 2025 I put it in my 2500 Chevrolet. Duramax seems to be giving me better fuel mileage and key lubricating parts. Very happy with this product. I highly recommend it.
W
I use it in all my diesel equipment and trucks and fuel mileage has increased in my trucks
B
I have been using this for the last few months in my ‘05 F250 and can confirm positive results. It seems to have given renewed vigor to the old engine with faster turbo spool up and better engine response. The engine is running better than it has in years. Unfortunately, I have seen a decrease in mpg probably because of my right foot!! The truck is fun to drive again!!!
J
Marked Improvement to fuel economy
S
I ran max amount for the higher centane. I did see less regens. Not sure about better mileage, but I drive it like I stole it.
N
Gives me a little piece of mind that I'm adding lubricity to my fuel and maybe a slight increase in cetane but I haven't noticed any increase in performance or MPG. 🤷
J
My son told me to buy this, he uses it 8n his Ram Cummins. I have a SUPER C motorhome with a Chevy 5500hd Duramax.
I used it in a recent 800 mile trip and it ran great, not sure I have a real life comparison since I've only had the rig for 3 months. My son does his homework and swears by it, so I do too!
s
So, started off with the bottle of 6400 and ran 1 tank of fuel (averaging 19mpg) filled up again and added 4 oz of 6500. My truck has 376k on it, hasn't been deleted or tuned. Now after about 3 tanks ran through using 2oz of 6500, I'm averaging around 25 to 26mpg and the truck runs so much better. I have more acceleration and less engine noise. I'm very happy and I'm not one that is easily impressed.
L
Started using it a little over a month ago and have seen better regen
T
I have a 15 F-250 6.7 with 340,xxx miles on it and the mpg, stay around 12.7-13 (before) and now it's staying around 14.7-15 mpg so yea it definitely works and I would 100% recommend people to try it... now I'm gonna be trying the AR6400-D Diesel Fuel System Cleaner and see how much that helps out
AR6500 FAQs
AR6500 is compatible with all diesel vehicles and equipment, including Power Stroke, Cummins, Duramax, European diesel cars and SUVs, light- and medium-duty trucks, agricultural equipment, commercial vehicles, and heavy trucks up to Class 8.
AR6500 can be used in pre-emissions, emissions-equipped, and deleted diesel engines and is compatible with ULSD, renewable diesel, and biodiesel blends.
Regular use of AR6500 will protect your fuel system and post-combustion system while boosting cetane and lubricity. By improving the quality of the diesel you are using you will prevent performance loss over time and extend the life of your engine and fuel system components, reducing maintenance costs over time.
Yes.AR6500 boosts cetane, cleans injectors, and improves fuel lubricity, leading to more efficient combustion, better throttle response, and reduced wear on your engine and fuel system.
By keeping injectors clean and increasing cetane, you'll also create fewer deposits over time, reducing maintenance and improving overall performance.
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.
When using AR6400-D, we recommend running it in a tank on its own, then following up with AR6500 from the next fill-up onwards.
AR6500 will remain stable for 2 years 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 down to -44ºF.
Add AR6500 to the fuel tank at every fill-up at 1 oz per 10 gallons of diesel.
For best results, use a Power Boost dose (2 oz per 10 gallons) in your first tank.
Archoil products will not void your warranty. AR6500 is used by owners of trucks in and out of warranty every day. If you have any specific warranty concerns, please consult your vehicle manual.
