Name: Ultimate Diesel Kit
Brand: Archoil
SKU: AR-UDK
Price: 89.9 USD
Availability: InStock

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Use AR6400-D Diesel Fuel System Cleaner and AR6500 Diesel Treatment to protect your engine, restore your diesel fuel system and boost performance. We recommend using AR6400-D every 5,000 miles and AR6500 in every tank of fuel. Upgrade your oil at every oil change with AR9100.

AR6400-D Diesel Fuel System Cleaner

One 12 oz bottle of AR6400-D treats 40 gallons of diesel fuel.

Add directly to the fuel tank before filling up.

Use every 5,000 miles OR use once for a deep clean and then follow up with AR6500 every fill-up for continuous cleaning.

AR6500 Diesel Treatment

Standard: 1 oz (30ml) of AR6500 per 10 gallons of diesel.

Power Boost: 2 oz (60ml) per 10 gallons of diesel.

Add to the fuel tank before every fill-up. Wait until the next fill-up if using AR6400-D.

AR9100 Friction Modifier

For engines, limited slip differentials and motorcylces, use 1.2 oz of AR9100 per quart of conventional or synthetic oil.

For all Power Strokes, use 16 oz of AR9100 every oil change to eliminate & prevent stiction.

For gear oil, hydraulic oil and power steering fluid, use 3.2 oz of AR9100 per quart.

AR6400-D and AR6500 are suitable for use in all diesel vehicles, including newer systems such as High Pressure Common Rail.

AR9100 is suitable for use in all Diesel & Gas engines. For 6.0L and 7.3L Power Stroke engines, AR9100 has the added benefit of eliminating stiction issues.

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Restore & Maintain Injector Performance

Improve combustion
Correct spray patterns
Reduce carbon deposits
Enhance fuel economy

Most diesel fuel lacks the detergents and cetane needed to prevent carbon build-up, leading to poor combustion, reduced power, and potential injector failure.

AR6400-D contains a strong dose of highly concentrated detergents which quickly remove internal diesel injector deposits (IDIDs) and heavy carbon build-up from injector tips.

Reduce Deposits & Turbo Lag

Restore boost
Reduce excess heat and wear
Prevent premature failure

The chemistry in AR6400-D reduces build-up in the turbo.

Carbon build-up in diesel turbos significantly impairs performance by restricting airflow and increasing exhaust backpressure, leading to turbo lag, reduced fuel efficiency and potential engine failure. In VGTs, carbon deposits cause the vanes to stick, resulting in inconsistent power delivery.

Reduce DPF Deposits & Regen Frequency

Restore MPG & performance
Protect against engine damage
Prevent costly DPF replacement

Over time, carbon builds up in the Diesel Particulate Filter (DPF) which results in more frequent regenerations, poor engine performance and potential failure. DPF replacement costs typically range from $2,000 up to $10,000.

AR6400-D Diesel Fuel System Cleaner is specifically formulated to reduce soot and heavy carbon deposits in the DPF.

Boost Cetane & Increase MPG

Improve combustion efficiency
Increase power and response
Extend component life

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 and enables optimized engine performance.

Improve Lubricity & Engine Life

Protect engine components
Reduce maintenance costs
Improve engine reliability

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.

Keep Injectors, Turbo & DPF Clean

Restores injector spray patterns
Protects turbo performance
Reduces DPF regeneration frequency

AR6500 contains a maintenance dose of AR6400-D's detergent package for continuous cleaning of the entire fuel system.

As AR6500 is added to the tank at every fill-up, your engine will always have the detergents it needs to break down existing build-ups while preventing the formation of harmful new deposits.

Maximize Power with Advanced Friction Reduction

Excessive engine friction causes power loss, reduced fuel efficiency, heat, noise, and vibration, leading to wear and a less comfortable drive.

AR9100 provides vital lubrication to reduce wear and keep components running smoothly throughout the entire oil cycle and is proven to reduce wear by up to 43% in ASTM testing.

Smoother, quieter operation
Lower friction boosts power output
Reduced engine heat and vibration

Protect Your Engine with a Lubricating Shield

AR9100 creates a solid lubricating barrier that protects engines, gearboxes, and hydraulic systems under extreme pressure. Unlike zinc-based additives, it withstands high stress to enhance durability and performance.

In ASTM testing, AR9100 increased a branded lubricant's load-carrying ability from 3,964 lbs to over 4,500 lbs, significantly improving its anti-wear and friction reduction properties.

Provides strong anti-wear protection
Resilient under extreme pressure
Extends component life

6.0L & 7.3L Power Stroke Stiction Fix

AR9100’s nano‑lubricant cuts through the varnish that forms on HEUI spool valves, dissolving stiction deposits and laying down a slick, wear‑fighting film. By lowering static friction inside 6.0 L and 7.3 L Power Stroke injectors, it brings cold‑start fueling back on time, smooths idle, and delivers the crisp throttle feel your truck had when it left the factory.

Dissolves sticky varnish in HEUI injectors
Restores smooth starts and steady idle
Maintains lubrication under extreme oil pressure

5 stars: 1200 (89%)
4 stars: 72 (5%)
3 stars: 41 (3%)
2 stars: 17 (1%)
1 star: 14 (1%)

Some of the reviews shown are from related products the merchant grouped with this one.

Wonderful product

⭐⭐⭐⭐⭐ 5-Star Review – Archoil
I’ve been using Archoil in my 2025 GMC Sierra 1500 Elevation with the 3.0L Duramax diesel, and I’m very pleased with the product!
With the amount of highway miles I drive (48,000 miles a year) engine protection, fuel efficiency, and long-term reliability are important to me. Archoil has become part of my regular maintenance routine, and I’m confident in the added protection it provides.

Great product that I’d highly recommend to fellow Duramax owners!

6.2 Detroit Diesel

I put this in my 87 GMC with the 6.2 diesel engine and it seems like it’s doing the job. Still running the 6400 cleaner. I have a few sticky injectors and it seems to be helping.

My favorite diesel additive

I’ve been using the Archoil Diesel Fuel System Kit and have been very impressed with the results. The truck seems to run smoother, with better throttle response and a noticeable improvement in overall drivability. The fuel system also seems to operate quieter, especially during cold starts.
The kit was easy to use and feels like a quality product. I like that it’s designed specifically to clean and maintain the diesel fuel system rather than just being a basic fuel additive.
So far, I’m happy with the performance and would definitely recommend the Archoil Diesel Fuel System Kit to other diesel truck owners looking to keep their fuel system clean and running properly. I’ll definitely be using it as part of my regular maintenance.

2019 chevy equinox diesel

I've been using your products continuously since 2020 at 20.000 miles today I've got
93 .000 miles and no problem s at all . oil changes every 3000 .miles with friction modifier. And fuel cleaners every tank full . But I may be my own worst enemy as my warranty runs out at 125000 miles 2028 .time will tell ps my Def doesn't ever go into regeneration. .

Never fill up without it

Every tank of diesel in my 5th gen Cummins gets treated!

Diesel Drink

I bought a used Ford F-250 and read up on numerous different additives, but when I read the reviews on Archoil, I was impressed, so I tried it and my used truck came to life and runs like a scald animal. I Love Archoil… hands down.

False claims

I decided to give Archoil a fair shot in my 2014 Ford F-350 6.7 Power Stroke after seeing all the claims about improved fuel economy, smoother operation, and overall performance. I ran the product exactly as directed for about a month.

Unfortunately, I haven’t seen any measurable improvement in fuel mileage. My truck is well-maintained, and my MPG has remained essentially unchanged. I also didn’t notice any significant difference in power, throttle response, or engine smoothness.

I’m not saying it won’t work for everyone, but based on my experience, it did not deliver the fuel economy gains that were advertised. For the price, I expected to see some noticeable results.

The product didn’t cause any problems, but I can’t say I’d buy it again based on the results I’ve seen so far.

Pros: Easy to use, no negative effects.
Cons: No noticeable fuel mileage improvement, expensive for the results.

Just one diesel owner’s honest experience. Your results may vary.

Archoil-Diesel

This product works very well. I could tell the deference after running the diesel cleaning product & now the maintence product (used on every refill of diesel).

I'm totally impressed with Arcoil & highly recommend it!

The Best Product Out There

If you are doing a diesel truck you need the best thing out there. Treat your truck the way it was intended and it will get you where you need to go. 190K + miles and counting strong.

2026 Ram Laramie Megacab Dually

Love this stuff ran it on my brand new truck around 4k miles so a little early but run the diesel treatment at every fill-up and as she becomes broken in I’m getting close to 600 miles and over on a tank at 31 gallons due to me having the Megacab so I love it and the truck! I’ll be ordering another kit here soon.

My 2012 ford f350 just purrrrs

My nephew is a diesel mechanic for a large California vineyard. He turned me on to it to preserve my “new to me” 2012 F350 with low miles. Love the product sharing with my family who all drive diesel trucks. Buying my second kit to make sure I’m not without.
Thank you Laurie

2002 7.3 F250

Had to wait to use this product once I bought do to injector cups failing (280k miles) I just went through my first few tanks of fuel before using the fuel system cleaner first. So far notice at about half tank being used of fuel better start better throttle response and just overall seems to just run better I will write another review once I use the friction modifier & diesel treatment few of my friends recommend this product and happy with results

Diesel fuel system kit

I was skeptical about it but It improved my gas mileage in my sprinter van would recommend this product.

POWERSTROKE GRAVY !

It says it’s for a 6.0 or a 6.7 , however, I got the famous 2008 king Ranch Ford 6.4 L power stroke
I put the recommended dose in every third fill up and not only do I get better gas mileage. My DPF burns a lot less. Thank you 🙏

EBO cattle company

My 2018 Chevrolet 3500 Duramax I used the cleaner and Archoil winter additive on the 3 rd tank seen an 3 mpg increase and a very noticeable increase in power. Very satisfied

Amazing

Archoil works that's all I can say. I instantly noticed a difference in my fuel economy and how my truck ran with the injector cleaner.

Excellent additive

I have used different kinds of additive with no noticable difference. Archoil is great stuff. My 2022 Ram is loving this stuff. Regens are happening 24 hours now or 900 to 1300 miles up from around 400 miles prior with same driving conditions. Can't complain about the fuel mileage either. Add it at every fill up.

Magic in a bottle

I’ve been running this in my 2022 6.7 Cummins. Started with the black bottle and went to the clear bottle. Been doing 2 oz per 10 gallons. I’m on my second tank of that. Legit getting 2 mpg better on the freeway. Truck runs smooth and is really peppy. Highly recommend. Wish I knew about this stuff sooner than 60k miles on my truck. I’m going to drop down to 1 oz per 10 gallons next tank and see the results. Just buy it you won’t regret it!

more miles to the gallon

I noticed a big difference in engine knocking at lower rpm. When I started the truck was running 10.0 miles per gallon. After using cleaner and being almost done with my first bottle of fuel additive roughly 5 full tanks of diesel. I'm at 12.2 mpg with a high of 12.8 mpg. All in town driving no highway miles yet. I'm fixin to order me other bottle!

Great products!

I did an oil change and both fuel filters on my 2022 RM 3500. I got just over a half mile to the gallon improvement! Happy customer!

Great Product

I have been using this for over a year now and my truck continues to run better, the regins have increased from about 300 miles to about 400 miles now, I am retired now and my trips have gotten shorter and shorter and I really think Archoil has saved my truck, thanks for a great product, I also use the oil additive and of course the diesel oil product

Black Knight completely happy with the product!

I have used Archoil for summer pump lubrication and winter fuel treatment. It works well and has an easy measurement pour device built in. I wish they would offer a bottle mount for my pick up box. This would make it easier to carry the product both in the winter and summer. There is a horrible knock off on the internet and it doesn’t work with the bottle. The product works great and I highly recommend it!

No difference

I’ve ran the bottle of cleaner and a few full treated tanks of fuel additive. I haven’t noticed a difference whatsoever. Mpg stayed the same. Maybe it’s because I have a 2024 L5P that had no issues to start with.

Ultimate Diesel Kit