Archoil Diesel Fuel System Cleaner AR6400-D 12 oz — Injector, Turbo & DPF Deposit Cleaner for Restored Power

Archoil AR6400-D is a concentrated 12 oz diesel fuel system cleaner engineered to dissolve injector, turbo, and DPF-related deposits to restore performance and smoother combustion.

When diesel drivability, throttle response or regeneration frequency start to suffer, targeted chemical cleaning can recover lost performance without disassembly. AR6400-D is formulated to be poured directly into the fuel tank; one 12 oz bottle treats 30–40 gallons and is intended for periodic use to remove performance-robbing deposits throughout the fuel system. It pairs with Archoil AR6500 for ongoing maintenance that addresses lubricity and cetane shortcomings often found in pump diesel.

How does AR6400-D clean injectors and improve combustion?

The formula contains concentrated detergents and deposit-dispersing agents designed to break down varnish and carbon on injector tips and spray orifices. Cleaning restores proper spray patterns and atomization for more complete fuel burn without changing engine parts.

• Targets injector deposits that cause poor spray or dribbling
• Improves atomization for smoother idle and better throttle response
• One bottle treats 30–40 gallons for full-system exposure

Will AR6400-D help my turbocharger and DPF performance?

Yes—reducing upstream deposits helps prevent carbon buildup that can impair turbo response and increase DPF loading. By clearing fuel-related deposits, the product supports steadier boost behavior and can reduce the frequency or severity of DPF regenerations driven by soot accumulation.

• Controls deposit formation that influences turbo spool and boost recovery
• Lessens soot/soot-precursor buildup to support cleaner DPF operation
• Helps maintain consistent combustion temperatures that aid regeneration

How do I use AR6400-D and how often should I treat my tank?

Usage is straightforward: pour the 12 oz bottle into a nearly full tank, then drive normally to circulate the product through the system. For proactive care, use every 5,000 miles or as needed when you notice performance loss; occasional treatments after heavy-duty or high-mileage use are also effective.

• Pour entire bottle into fuel tank; one bottle treats 30–40 gallons
• Drive normally to allow the formula to flow through injectors and fuel components
• Recommended interval: about every 5,000 miles or based on observed drivability

What maintenance should I follow after using this cleaner?

After a deep clean with AR6400-D, follow up with a daily-use diesel treatment to preserve results. Archoil AR6500 is recommended at every fill-up to maintain lubricity, control deposits, and help sustain cetane levels, reducing the need for frequent deep clean cycles.

• Use AR6500 at each fill-up to extend cleaning benefits
• Regular treatments reduce frequency of heavy clean cycles
• Combine with routine fuel filter and service intervals for best outcomes

Who is this for? AR6400-D is aimed at diesel truck, van, and equipment owners who want to restore or maintain fuel-system performance without disassembly—especially those noticing rough idle, sluggish response, increased fuel smoke, or more frequent DPF activity. It's suitable for personal and commercial diesel vehicles, including turbocharged engines, and for owners who prefer in-tank chemical maintenance paired with a follow-up treatment plan.