Archoil AR6500 Diesel Treatment 40 oz - Cleaner, Cetane Boost, MPG

Our review of the Archoil AR6500 Diesel Treatment finds it best suited for diesel owners who want a single, regular additive to tackle fuel-related performance and long-term component health. In short, this 40 oz bottle treats 400 gallons and is designed to be used at every fill-up; the biggest reason to buy is its combined approach of a combustion modifier and a strong cetane boost that both restores lost performance and helps reduce costly post-combustion issues like frequent DPF regenerations. The review is based on product specs and consistent customer feedback about fuel mileage and reduced regen frequency.

Key Features

• 40 oz bottle treats 400 gallons: A concentrated dose allows routine use at every fill-up without frequent repurchasing and simplifies maintenance scheduling.
• Designed for modern diesel fuels: Formulation targets fuel-related performance loss to restore and maximize fuel economy and throttle response.
• Cleans the post-combustion system: The treatment is stated to clean turbo and DPF components, which helps prevent premature failure and lowers regeneration frequency.
• Combustion modifier and cetane boost: Proven combustion modifier technology and a strong cetane lift improve power, throttle response, and smoother running.
• Protects fuel system components: Cleans, lubricates and protects injectors and high-pressure common rail (HPCR) systems to maintain reliability.

Who It's For

Diesel pickup and commercial vehicle owners who regularly experience reduced MPG, frequent DPF regens, or sluggish throttle response will see the most benefit from the Archoil AR6500. It fits owners who prefer adding an additive at each fill-up to maintain system cleanliness and extract measurable fuel-economy gains.

Those who rarely drive diesel or who already follow a strict dealer maintenance program for emissions hardware may see less obvious short-term benefit. This is not a replacement for mechanical repair; vehicles with severe mechanical faults or non-fuel-related issues should be serviced rather than relying solely on additives.

Pros & Cons

Pros

• Improves fuel mileage and engine smoothness, with customer reports of up to several MPG gains and noticeable performance improvement.
• Reduces DPF regeneration frequency and helps protect turbo and post-combustion parts, which can lower repair risk and downtime.
• Cleans and lubricates fuel system components including HPCR systems to support long-term reliability.
• Concentrated dosing treats 400 gallons from a single 40 oz bottle, offering good value when used regularly.

Cons

• Not a substitute for mechanical repairs; vehicles with existing component failure need service rather than additive treatment.
• Benefits like MPG improvements and regen reduction depend on fuel quality and driving patterns, so results can vary by vehicle and use case.

Specifications

Product	AR6500 Diesel Treatment
Volume	40 oz
Treatment Capacity	Treats 400 gallons
Recommended Use	Use at every fill-up
Key Actions	Cleans post-combustion system, boosts cetane, combustion modifier
Systems Protected	Fuel system including HPCR, turbo, DPF

Our Verdict

The Archoil AR6500 is a practical, value-minded additive for diesel owners who want to improve fuel economy and protect expensive post-combustion hardware. Regular use at fill-ups delivers cleaning, lubrication and a measurable cetane boost, making it a solid preventive product that pays for itself for drivers who put meaningful miles on their diesel vehicles.

Frequently Asked Questions

How often should I use this treatment?
Use at every fill-up as directed to maintain cleaner combustion and consistent protection across fuel fills.

Will this fix a failed DPF or turbo?
No. It helps prevent premature failure and reduce regen frequency but is not a repair for mechanically failed components.

How much fuel does one bottle treat?
One 40 oz bottle treats approximately 400 gallons of diesel, making it a concentrated option for routine use.