Archoil Ultimate Diesel Kit - Restore Performance & Improve MPG

Our review of the Archoil Ultimate Diesel Kit finds it best suited for owners of light- and heavy-duty diesel trucks who want a simple, all-in-one maintenance boost. The kit combines three formulations that address friction, combustion quality and fuel-system deposits, so the single biggest reason to buy is improved driveability and measurable fuel economy gains without swapping parts or scheduling shop time. Buyers report smoother idle, quieter operation and easier cold starts after regular use, making this a practical in-garage solution for drivers seeking reliable, ongoing diesel care.

Key Features

• Complete three-product kit: Includes a friction modifier, a diesel treatment and a fuel system cleaner to tackle lubrication, cetane and deposits in one purchase.
• Friction reduction: The AR9100 friction modifier is formulated to reduce internal friction, which helps quiet the engine and improve smoothness under load.
• Fuel economy improvement: Regular use of the AR6500 diesel treatment at fill-ups is intended to boost cetane and improve combustion efficiency for better miles per gallon.
• Rapid cleaning action: The AR6400-D fuel system cleaner targets deposits in injectors and the fuel path to restore spray pattern and throttle response.
• Long coverage from treatment: The 40oz diesel treatment treats up to 400 gallons, making it a cost-effective option for drivers who fuel frequently.

Who It's For

This kit is aimed at diesel owners who perform routine maintenance themselves and want a straightforward additive program to restore performance, reduce engine noise and help with cold starts. Fleet operators or owners of older diesel trucks with accumulated deposits will find the combined chemistry useful for bringing back smoother idle and better throttle response without immediate mechanical work.

Those who should look elsewhere are owners wanting a single-product quick fix for a specific problem; if the issue is a mechanical failure or injector replacement is required, additives alone will not be sufficient. Also, buyers expecting dealer-level diagnostics and repair should consult a technician rather than relying solely on an additive kit.

Pros & Cons

Pros

• Restores engine smoothness and reduces audible engine noise after regular use.
• Can improve fuel economy and cold start capability when used as recommended at fill-ups.
• Combines friction modifier, diesel treatment and fuel system cleaner for comprehensive coverage.

Cons

• Does not replace mechanical repairs; severe injector or fuel pump failures require shop service.

Specifications

Kit contents	AR9100 (16oz), AR6500 (40oz), AR6400-D (12oz)
Primary purpose	Friction reduction, diesel treatment, fuel system cleaning
Treatment coverage	AR6500 treats up to 400 gallons
Vehicle type	Diesel vehicles and trucks
Benefits	Restores performance, cleans fuel system, provides cetane boost

Our Verdict

The Archoil Ultimate Diesel Kit is a practical, value-forward choice for diesel owners who want to restore engine smoothness, improve cold starts and pursue better fuel economy without immediate shop work. Because it brings together a friction modifier, a high-coverage diesel treatment and a targeted fuel system cleaner, it represents good value for routine maintenance and for drivers noticing drivability degradation due to deposits.

Frequently Asked Questions

How often should the diesel treatment be used?
The AR6500 diesel treatment is designed for regular use at fill-ups and its 40oz bottle treats about 400 gallons, so dosing every tank as directed delivers ongoing benefits.

Will this fix hard mechanical failures?
No. The kit improves combustion, reduces friction and cleans deposits, but it will not replace injector or pump replacement if parts are failing.

Can I use this in all diesel engines?
Yes, the formulations are intended for diesel vehicles, but always follow manufacturer recommendations and dosing instructions for best results.