AR6500 Diesel Treatment Two Pack - Cleans, Lubricates, Boosts Power

Our review of the AR6500 Diesel Treatment two pack finds it well suited for diesel owners who want a single additive that addresses modern fuel problems and keeps high-pressure common rail systems protected. The bottom line: this two pack treats up to 800 gallons and combines a proven combustion modifier with a strong cetane boost to improve response and efficiency, so drivers chasing better fuel mileage and fewer regens will likely see meaningful gains.

Key Features

• Treats up to 800 gallons: The two 40 oz bottles together cover a large service interval, which reduces how often you add treatment and simplifies maintenance.
• Designed for modern diesel fuels: Formulation targets issues common with contemporary low-sulfur and bio-blended diesel to help maintain performance.
• Combustion modifier technology: Improves burn quality for smoother engine response and can reduce visible smoke under load.
• Strong cetane boost: Increases ignition quality, which helps deliver better throttle response and can improve fuel economy.
• Cleans and lubricates fuel system: Helps remove deposits and restores lubrication to injectors and pump components, including HPCR systems.
• Protects fuel system: Ongoing use helps lower the frequency of regens and preserves system components against wear.

Who It's For

The AR6500 Two Pack is ideal for owners of diesel pickups, work trucks, and fleet vehicles who want improved fuel mileage, fewer forced regens, and cleaner injectors without frequent dosing. It particularly suits those running modern diesel blends or high-pressure common rail (HPCR) systems that need extra lubrication and deposit control.

Those who should look elsewhere are drivers seeking a treatment for gasoline engines or someone wanting a product focused solely on cetane increase without deposit control. If you prefer single-dose, ready-to-use smaller bottles for infrequent drives, this two-pack is more than you need.

Pros & Cons

Pros

• Noticeable improvements in fuel mileage and engine smoothness reported by users.
• Two 40 oz bottles give long service life, treating up to 800 gallons total.
• Combines cleaning, lubrication and a cetane boost for multipoint benefits to the fuel system.
• Works on HPCR systems, offering protection where it matters most in modern diesels.

Cons

• Requires proper dosing per gallon; occasional users may find the bottle size larger than needed.
• Benefits such as mpg gains depend on driving conditions and vehicle state, so results can vary.

Specifications

Product	AR6500 Diesel Treatment (two pack)
Package size	2 x 40 oz bottles
Treatment coverage	Up to 800 gallons
Primary function	Combustion modifier and cetane boost
System compatibility	All diesel vehicles including HPCR systems
Main benefits	Cleans, lubricates and protects fuel system

Our Verdict

The AR6500 Diesel Treatment two pack is a solid choice for diesel drivers seeking a combined cleaner, lubricant and cetane improver that addresses modern fuel issues and helps reduce regen frequency. It offers good value for long service intervals and is recommended for owners of diesel trucks and fleets who want measurable improvements in fuel economy and system protection.

Frequently Asked Questions

How many gallons does the two pack treat?
The two 40 oz bottles together treat up to 800 gallons of diesel fuel when dosed as directed.

Is this safe for high pressure common rail systems?
Yes, the formulation is designed to clean, lubricate and protect HPCR systems as well as other diesel fuel systems.

Will it improve fuel mileage?
Customers report improved fuel mileage, with some seeing gains up to several mpg depending on vehicle and driving conditions.