Archoil AR6500 Diesel Treatment (40 Ounces) - Treats 400 Gallons - Additive for All Diesel Vehicles
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Availability:
In Stock.
Arrives
Friday, Mar 20
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Size: AR6500 (40oz)
Features
- EASY USE AT EVERY FILL-UP: Add directly to the fuel tank at each fill-up. The long neck and measuring chamber make treating fuel simple. One 40 oz bottle treats up to 400 gallons
- FOR ALL DIESEL ENGINES: Suitable for use in all diesel vehicles and equipment - light-duty, heavy-duty, pickup, SUV, van, RV, etc. (including modern HPCR systems)
- IMPROVES LUBRICITY (ASTM D6079): Tested to improve lubricity by 43% to help protect fuel system components, including wear-sensitive parts like the CP4 pump
- BOOSTS CETANE UP TO +8: Raises cetane up to 8 points for faster ignition, smoother combustion, and improved drivability; many engines run best around 4850 while pump diesel is often 4045
- CLEANS INJECTORS: AR6500's detergent package removes injector deposits and restores spray patterns for improved atomization, supporting better performance and fuel economy
- SUPPORTS DPF & REDUCES REGENS: Targets deposit formation to help keep the DPF clean and reduce regeneration frequency restores performance, fuel economy, and extends DPF lifespan
- KEEPS TURBO CLEAN: Helps reduce fuel soot and deposit formation that impacts turbo response, restoring boost and smoother acceleration
Features
- 40.6 oz bottle treats 400 gallons - Use at every fill-up
- Formulated to address issues with modern diesel fuels
- Incorporates Archoil's proven combustion modifier technology and a strong cetane boost to increase power and response
- Cleans, lubricates and protects your fuel system (including HPCR systems)
- Increases fuel economy (MPG)
Manufacturer: Archoil
Brand: Archoil
Item Weight: 3.24 pounds
Package Dimensions: 12.91 x 6.3 x 6.22 inches
Manufacturer Part Number: AR6500-40
Date First Available: November 1, 2021
Manufacturer: Archoil
Brand: Archoil
Item Weight: 2.99 pounds
Package Dimensions: 14.57 x 6.81 x 3.43 inches
Item model number: AR6500-40
Manufacturer Part Number: AR6500-40
Date First Available: November 1, 2021
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Mar 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 40 oz Two Pack
The Archoil AR6500 Diesel Treatment is hands down one of the best diesel additives I’ve used. After adding it, I noticed smoother engine operation, quieter idle, and improved throttle response almost immediately ⚙️✨. The fact that the two-pack treats up to 800 gallons makes it a great value, especially for regular diesel use. It gives peace of mind knowing it helps with injector cleanliness, fuel system protection, and overall efficiency 🛢️💪. Easy to use, high quality, and delivers real results—this is now a staple for my diesel maintenance routine! 👍🚀
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Reviewed in the United States on December 29, 2025 by Magda
Size: 40 oz Two Pack
I suspect my Audi 3.0 TDI had a clogged cat some 5 years after a DPF delete back in 2019. MPG was down and it felt like it was also down on power. Sometimes the "Italian Tune-up" (high rev driving) would briefly help by blowing a lot of crap out the back, but it would go back to reduced after a day or two. I had been using the Hotshots Every Day in each fill-up, which may have slowed this issue down but it still happened. I also tried Opti-Lube XPD for a few months. Not much, if any, improvement. I do suspect they helped improve cetane values, but idk what else. If I had a good run, I was getting ~560 miles per tank. After some YouTube videos, I decided to try Archoil. I didn't notice anything for a couple fill-ups, but after about 1-1.5 months, I started to notice some slight improvements in mileage to/from work and some other trips. It was getting hard to hit 30 mpg on the way to work, whereas I started hitting 31-32, even with significant traffic. After 2 months, there has been a definite improvement. I'm currently seeing 33+ mpg on the way to work (same conditions as before) and reaching closer to the 38 mpg EPA advertised on my way home. I've also hit 42 mpg coming home from a friends' house, whereas before it was struggling to hit 39. Power feels like it has returned to expected levels compared to the previous treatments. My range is now reporting >600 miles per tank, even dealing with some stop and go traffic. For the results, price, and ease of applying into the tank, I highly recommend using it and I intend to continue using this from hereon out.
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Reviewed in the United States on September 23, 2025 by Bob
Size: AR6500 (40oz)
Great products, love taking care of our diesel adding protection, performance. Competitive price.
Reviewed in the United States on November 27, 2025 by FlatlineYourBird Series Decoys LLC
Size: 10.1 oz Four Pack
I have noticed positive changes to the mpg, power, and exhaust smell. I used the popular competitor product for six months and I didn't notice any changes. I'm very impressed with just two uses. I'm hoping to keep this diesel pickup forever and I think this will help me achieve that goal.
Reviewed in the United States on November 24, 2025 by Bryan
Size: 40 oz Two Pack
My 2020 F150 , loves this product .148 K and going strong. Been using Archoil products for awhile now. Good product equals peace of mind.
Reviewed in the United States on January 6, 2026 by Lee Hernandez
Size: 40 oz Two Pack
Maybe there is such a thing as a mechanic in a can. I bought a Dodge RAM 2500 5.9 Cummins. It has 218k on it. I live off grid and drive 5.5 miles of slow going, country gravel road to get to my place. I felt the stutter in the engine going around curves and up hills at low speed and RPM. At this time I averaged 15.5 MPG on the factory digital display. I heard about this stuff from an old time that started using it in his old 99 RAM. I took his advice, and started using the full 3 part treatment . I've been consistently using all 3 products for more than a year now. I do the boost dose, 2oz per 10 gallons of diesel. My fuel economy has increased to average 17.4 MPG reading, there is absolutely no stutter at any speed or RPM. I'm NOT a mechanic, but I know a better running truck when I see it and drive it. I've got 248K now and this truck runs far better than it did the day I bought it thanks to a little TLC and the Archoil line.
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Reviewed in the United States on July 2, 2025 by Paul M. Nipper
Size: AR6500 (40oz)
Excellent product. Performs as stated
Reviewed in the United States on November 15, 2025 by Kirby Lane
Size: AR6500 (40oz)
Didn't help with my mpg but really helped with the dpf filter cleaning. Light was coming on every 40-50 miles. After using this for 10 tanks of deisel the light only comes on about every 3k miles. I now use it regularly. It seems to really help and would reccomend.
Reviewed in the United States on January 4, 2026 by M. Irwin