Archoil Diesel Fuel System Cleaner AR6400-D Two-Pack — 12 oz Bottles, Cleans Injectors & Restores Turbo/DPF Performance

Archoil AR6400-D Diesel Fuel System Cleaner (Two Pack) is a concentrated additive that cleans injector deposits, helps reduce DPF and turbo deposits, and restores fuel-system performance with one bottle per tank.

Designed for modern diesel engines, this two-pack of 12 oz bottles treats 30–40 gallons per bottle and is formulated for rapid deposit removal. It’s a pour-in product intended for routine maintenance every 5,000 miles or as needed to address sluggish response, compromised combustion, or increased DPF regeneration frequency. Use one bottle, drive normally, and follow with Archoil AR6500 Diesel Treatment at subsequent fill-ups to maintain results.

How quickly will AR6400-D clean my injectors and improve performance?

The formula is concentrated for fast action against performance-robbing deposits on injector tips and spray patterns. Users can expect measureable improvements in response and smoother idle after treatment, depending on deposit severity and engine condition.

• One 12 oz bottle treats 30–40 gallons of diesel.
• Pours directly into the tank — drive normally after addition.
• Visible drivability gains typically follow the first tank of treated fuel.

Will AR6400-D help my turbocharger and reduce DPF issues?

AR6400-D targets carbon and oily deposits that collect around turbochargers and the diesel particulate filter, helping restore turbo response and supporting cleaner DPF operation. By reducing buildup, the product can lower the frequency and severity of regenerations, depending on use and load cycles.

• Formulated to reduce deposits that affect turbo boost recovery.
• Helps limit particulate accumulation that contributes to more frequent DPF regenerations.
• Best used before deposits become heavy; repeat use as part of scheduled maintenance.

How do I use the two-bottle pack and maintain results long-term?

Using AR6400-D is straightforward: add one 12 oz bottle to 30–40 gallons of diesel, drive normally, and repeat as needed every 5,000 miles or when symptoms return. For ongoing protection and to address lubricity and cetane shortfalls from pumped diesel, follow up with Archoil AR6500 at every fill-up.

• Pour one bottle into the fuel tank before filling or with a full tank as directed.
• Recommended frequency: every 5,000 miles or when performance dips.
• Use AR6500 Diesel Treatment at each fill-up to sustain cleaning and lubrication benefits.

Is AR6400-D safe for modern diesel engines and emissions systems?

AR6400-D is formulated for use in contemporary diesel engines and emissions-equipped vehicles. It is designed to work within a fuel system without altering recommended fuel specifications, but always follow manufacturer guidelines and avoid overuse beyond recommended dosages.

• Compatible with common diesel engine types and aftertreatment systems when used as directed.
• Dosage limits: one 12 oz bottle per 30–40 gallons of diesel.
• Follow vehicle and product instructions; consult a technician for heavy deposit concerns.

Who is this for: AR6400-D is aimed at diesel owners who want a practical, pour-in solution to restore injector spray patterns, support turbo responsiveness, and help reduce DPF deposit buildup. It suits fleet operators, pickup and heavy-duty truck drivers, and anyone who prefers scheduled preventive maintenance or needs a targeted clean-up between service interventions. Pair the two-pack with AR6500 at fill-ups for continued protection and balanced fuel conditioning.