Archoil Diesel Fuel System Cleaner AR6400-D Two-Pack — Restores Injectors, Improves Turbo & DPF Performance

Archoil AR6400-D Diesel Fuel System Cleaner (Two Pack) is a concentrated add‑in that removes fuel‑system deposits to help restore injector spray, improve turbo response, and support cleaner DPF performance.

Engine deposits form from combustion byproducts and low‑quality fuel, which can reduce power, worsen throttle response, and increase soot in the diesel particulate filter. This two‑bottle value pack provides two 12‑ounce doses; each bottle treats 30–40 gallons of diesel and is formulated to act quickly when added directly to the fuel tank.

How do I use AR6400-D and how often should it be applied?

Using AR6400-D is straightforward: pour one 12‑ounce bottle into a fuel tank containing 30–40 gallons of diesel and drive normally so the cleaner circulates through the system. For preventative care, use at approximately every 5,000 miles or whenever you notice reduced performance, rough idle, or diminished throttle response.

• One bottle treats 30–40 gallons of diesel
• Pour directly into tank, then drive to circulate
• Typical interval: every 5,000 miles or as needed
• Two‑bottle pack offers a refill and value savings

What parts of the fuel system does this cleaner target?

AR6400-D is designed to reach and dissolve deposits across the fuel system, with a focus on injector tips, turbocharger inlet areas, and soot‑prone regions that impact the diesel particulate filter. By reducing carbon and varnish buildup it helps restore spray patterns, support turbo responsiveness, and reduce DPF loading.

• Removes injector deposits to improve atomization
• Helps break down turbo deposits that hinder boost
• Reduces deposits contributing to DPF clogging and regeneration
• Works quickly when mixed into the fuel stream

Will AR6400-D affect emissions systems or engine oil?

AR6400-D is formulated for in‑tank fuel system cleaning and is not intended to change engine oil properties. It reduces deposit migration to emissions hardware by cleaning fuel-side sources of soot and unburned fuel, which can ease DPF regeneration frequency without modifying engine oil performance.

• Cleaner acts in the fuel stream, not as an oil additive
• Can reduce soot production that burdens the DPF
• Safe when used according to label directions
• Follow up maintenance with AR6500 for lubrication and cetane support

How will I notice the benefits after treatment?

Improvements are often apparent in throttle feel, smoother idling, and a quicker turbo response as injector spray returns to optimal form. Drivers may also experience fewer forced DPF regenerations or cleaner regeneration cycles when carbon sources are reduced at the fuel‑system level.

• Smoother acceleration and faster turbo spool
• Reduced rough idle and improved driveability
• Less frequent or more effective DPF regenerations
• Maintained results when combined with AR6500 at fill‑ups

Who is this for: AR6400-D is aimed at owners of diesel cars, trucks, vans, and equipment who want a practical in‑tank solution to reverse performance loss from fuel deposits and help reduce DPF and turbo fouling. It suits fleets and individual owners seeking a simple, fast‑acting cleaner with the convenience and savings of a two‑bottle pack; pair it with Archoil AR6500 for ongoing maintenance and lubrication benefits at fill‑ups.