Archoil AR6400-D Diesel Fuel System Cleaner (12 oz) Deep

Product Overview

The Archoil AR6400-D Diesel Fuel System Cleaner is a high-performance additive engineered to restore and maintain peak efficiency in diesel engines. Designed for diesel vehicle owners who want to address performance loss caused by fuel system deposits, this concentrated cleaner targets injectors, turbochargers, and diesel particulate filters (DPF). It’s ideal for drivers experiencing rough idling, reduced power, or frequent DPF regenerations. The formula works quickly to dissolve harmful buildup and restore proper fuel flow, helping your engine run smoother and more efficiently. Whether you drive a heavy-duty pickup, commercial vehicle, or long-haul truck, AR6400-D is formulated to tackle the carbon, varnish, and soot deposits that accumulate over time—especially under demanding driving conditions like stop-and-go traffic or extended idling.

Key Features

• Rapid-Acting Deep Clean: This concentrated cleaner is formulated to act fast, targeting performance-robbing deposits throughout the fuel system. It penetrates and breaks down carbon and varnish buildup that accumulates over time, helping restore original engine responsiveness and efficiency. Unlike basic additives, AR6400-D is designed for a thorough clean, not just surface-level maintenance.
• Cleans Injectors Fast: Injector deposits can disrupt fuel spray patterns, leading to incomplete combustion and reduced power. AR6400-D effectively removes these deposits, restoring optimal injector performance for smoother engine operation, quicker throttle response, and more complete fuel burn. Clean injectors mean better fuel atomization, which directly improves combustion efficiency and reduces unburned fuel in the exhaust.
• Restores DPF Performance: Over time, soot and ash can accumulate in the diesel particulate filter, triggering frequent and sometimes incomplete regenerations. This cleaner reduces deposit buildup in the DPF, supporting cleaner operation and helping decrease the frequency of regeneration cycles. By minimizing soot accumulation, it helps maintain proper exhaust flow and reduces the risk of forced or parked regenerations that can interrupt your drive.
• Turbo Deposit Control: Turbochargers are sensitive to carbon deposits that can restrict airflow and reduce boost pressure. AR6400-D helps minimize this buildup, supporting smoother turbo spool-up, more consistent acceleration, and restored boost performance. A clean turbo operates more efficiently, delivering the power you expect without lag or hesitation.
• Easy to Use: Simply pour the entire 12 oz bottle into your fuel tank—no special tools or procedures required. One bottle treats 30–40 gallons of diesel fuel. For best results, use every 5,000 miles or as needed based on driving conditions and engine performance. The treatment integrates seamlessly into your routine; just add it during your next fill-up and drive normally.

Technical Specifications

• Product Dimensions: 8 x 8 x 8 inches; 1 Pound
• Item Model Number: FBA_AR6400-D
• Date First Available: June 2, 2014
• Manufacturer: Archoil
• ASIN: B072BWR7J3
• Best Sellers Rank: #1,071 in Automotive, #5 in Diesel Additives
• Customer Reviews: 4.7 out of 5 stars (2,723 ratings)
• Not discontinued by manufacturer

Benefits & Use Cases

The AR6400-D is particularly effective for diesel engines showing signs of deposit-related performance decline. It’s well-suited for trucks, SUVs, and commercial vehicles that operate under heavy loads or in stop-and-go traffic, where deposit formation is more common. Drivers who notice hesitation during acceleration, increased exhaust smoke, or frequent DPF warning lights may benefit from a treatment. It’s also useful as part of routine maintenance for high-mileage diesel engines or those using lower-quality fuel. Regular use can help prevent the gradual buildup that leads to costly repairs or reduced fuel economy.

For ongoing protection, Archoil recommends following up with AR6500 Diesel Treatment at every fill-up. While AR6400-D focuses on deep cleaning, AR6500 helps maintain fuel system cleanliness, improves lubricity, and supports optimal cetane levels in modern ultra-low sulfur diesel fuels. Together, they provide a comprehensive approach—AR6400-D for restoration and AR6500 for prevention.

Important Notes

Always use AR6400-D as directed—pour the full 12 oz bottle into the fuel tank before or after refueling. Do not exceed the recommended treatment ratio. This product is compatible with all diesel engines and safe for use with biodiesel blends up to B20. Avoid contact with eyes and skin; keep out of reach of children. Store in a cool, dry place away from direct sunlight. The product is not discontinued and remains in active production by Archoil.