The ONLY treatment your diesel needs in cold weather

Most cold weather diesel additives only offer anti-gel protection. AR6300 Winter Diesel Treatment increases lubricity, boosts performance, restores fuel economy and cleans the fuel system to ensure your diesel powers through the winter. Your vehicle gets all the benefits of AR6500 Diesel Treatment PLUS anti-gel protection at every fill-up.

AR6300's highly concentrated formula contains no fillers and utilizes Archoil's proprietary fluid technology to remove carbon build-up from the turbo, DPF and EGR. AR6300 delivers a complete clean and boost package to the entire fuel system to protect your engine and maximize performance.

Anti-gel protection

When temperatures reach freezing point (32°F), the wax in diesel fuel begins to crystallize and collect on the fuel filter. This is known as gelling and prevents fuel from getting to where it needs to be, leading to:

  • Trouble starting the engine
  • Poor acceleration
  • Sluggish and noisy performance

The anti-gel properties of AR6300 can prevent diesel fuel gelling down to -44ºF (using the Power Boost treat rate). Preventing gelling ensures your fuel system keeps working correctly through the colder months.

AR6300 Winter Diesel Treatment
AR6300 Winter Diesel Treatment
AR6300 Winter Diesel Treatment

AR6300 Winter Diesel Treatment

Sale price$44.95
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AR6300 Winter Diesel Treatment is added to every tank of diesel to boost performance, improve fuel lubricity, protect your fuel system and protect against gelling in cold weather.

  • Anti-gel - prevent diesel fuel from gelling and plugging the fuel filter
  • Boost cetane up to 8 points
  • Improve combustion efficiency
  • Increase fuel economy
  • Lubricate and protect the fuel system
  • Clean injectors, turbo and DPF (reduce regens)
  • Reduce maintenance and extend component life

At low temperatures diesel fuel gels and can plug your fuel filter and prevent fuel from folowing to the engine. AR6300 Winter Diesel Treatment lowers the cold filter plugging point of diesel which helps ensure fuel flows when you need it to.

Lubricity in fuel at the gas station is unlikely to meet the level your vehicle requires as EPA regulations don't meet the standards of the Engine Manufacturers' Association.

AR6300 improves lubricity and protects your engine against excessive wear and premature failure, reducing the potential for costly repairs. This is particularly important as diesel engines are more likely to suffer damage in cold weather.

AR6300 brings all the same benefits to your vehicle performance as AR6500 Diesel Treatment plus anti-gel protection.

AR6300 boosts cetane to improve combustion, keeps key fuel system components clean and protects against corrosion which leads to improvements in fuel economy (MPG).

41.3 oz bottle treats 275 gallons of fuel.

Standard: 1.5 oz of AR6300 per 10 gallons of diesel (reduces CFPP to -16ºF)

Power Boost: 3 oz per 10 gallons (reduces CFPP to -44ºF)

When no anti-gel protection is needed, use AR6500 Diesel Treatment.

Customer Reviews

Based on 99 reviews
steven d. (Moorcroft, WY, US)
absolute must

I have been using this product for over 5 years and I will continue until I can no longer own my truck.

Matt O. (Leonard, TX, US)
The best on the market

Live in north Texas. Use Archoil in both ford power strokes. They start easily and run great when it’s well below freezing. Highly recommend. Only additives I will use.

Nicholas D. (Pawtucket, RI, US)
Great bottle!

I love the no mess bottle. I have a 3.0 powerstroke so I’m only getting 20 gallons when I fill up and I’m not spilling conditioner everywhere. I’ve only used it twice so far, so not seeing any difference from my previous product.

Jose (Dallas, TX, US)
2019 6.7 Powerstroke

Noticed improved MPG and no issues with starting in the cold

Enhance Lubricity

AR6300 improves the lubricity of diesel fuel which is particularly important in cold weather as winter fuel contains less lubricity and diesel engines are put through more wear and tear when temperatures drop.

A lack of lubricity in fuel can lead to:

  • Excessive wear
  • Premature failure
  • Costly repairs

The Engine Manufacturer's Association (EMA) recommends using fuel that produces a wear scar no larger than 460 microns to meet the needs of a vehicle. The diesel fuel specification in the United States (D-975) is only 520 microns, meaning additional lubricity must be added to meet the EMA recommendation - highlighting the importance of diesel fuel additives.

In wear scar testing (ASTM D6079), base diesel fuel produced an out-of-spec scar width of 614.5 microns. The same fuel treated with AR6500 produced a scar width of 347.5 microns - a 43% increase in lubricity. Improving lubricity extends component life and prevents premature failure.

Read our blog on diesel lubricity

Maximize Fuel System Performance

As well as providing anti-gel protection and enhanced lubricity, AR6300 brings all the benefits of Archoil's all-in-one AR6500 Diesel Treatment. AR6300 boosts cetane, improves fuel efficiency and cleans the entire fuel system

If you haven't been using diesel treatments regularly, we recommend using our highly-concentrated AR6400-D Diesel Fuel System Cleaner before using AR6300. AR6400-D is a one-tank treatment which rapidly removes heavy build-up and deposits from the fuel system.


• AR6300 removes internal diesel injector deposits (IDIDs) and carbon build-up from injector tips

• AR6300 ensures correct injector spray patterns, resulting in a more complete combustion and lower emissions for optimized performance


• AR6300 clears the turbine and variable vanes of soot and carbon, reducing turbo lag and restoring boost

• AR6300 prevents the accumulation of carbon to reduce excess heat and wear, avoiding premature failure of the turbo


• AR6300 improves combustion to reduce carbon, soot and particulate exhaust emissions

• AR6300 removes soot and heavy carbon deposits from the DPF which reduces regen frequency, restores lost performance and prevents engine damage from a clogged DPF


"Seeing this F-350 run as smooth as it did the day it left the dealership definitely made believers out of us."

"Archoil is the Real Deal"
Diesel Power Magazine

"We are seeing great results using Archoil."

"I highly recommend Archoil products"
George Swift, Mechanic, Jay Leno's Garage

"Improved fuel economy, smoother running engine and no issues with cold starts."

"We're now believers in Archoil"
Diesel Tech Magazine