Archoil Diesel Fuel System Kit - AR6400-D (12 oz) + AR6500 (40 oz) - Complete Restoration For All Diesel Engines, Injector Cleaner, Lubricity Improver, DPF & Turbo Deposit Control, Cetane Booster

TWO-STEP FUEL SYSTEM RESET: Includes AR6400-D Diesel Fuel System Cleaner + AR6500 Diesel Treatment (40 oz) for a complete clean-and-maintain solution

HOW IT WORKS: Use AR6400-D first for a deep clean (12 oz treats 30-40 gallons), then use AR6500 at every fill-up for ongoing protection (40 oz treats up to 400 gallons)

FOR ALL DIESEL ENGINES: Suitable for all diesel vehicles and equipment, including modern HPCR systems

CLEANS INJECTORS & RESTORES RESPONSE: Removes injector deposits and restores spray patterns for smoother running, improved response, and more efficient combustion

IMPROVES LUBRICITY (ASTM D6079): AR6500 is tested to improve lubricity by 43% to protect fuel system components, including wear-sensitive parts like the CP4 pump

BOOSTS CETANE UP TO +8: AR6500 raises cetane up to 8 points for faster ignition, smoother combustion, and improved drivability

SUPPORTS DPF & REDUCES REGENS: Targets deposit formation to help keep the DPF clean and reduce regeneration frequency - supporting performance and fuel economy

KEEPS TURBO CLEAN: Reduces deposit formation that impacts turbo response for restored boost and smoother acceleration

Archoil Diesel Fuel System Kit combines AR6400-D Diesel Fuel System Cleaner with AR6500 Diesel Treatment to deliver a complete clean-and-maintain solution. Rapidly restore performance first, then upgrade fuel quality at every fill-up to maximize performance. How it works (simple 2-step process): Start with AR6400-D to deep-clean performance-robbing deposits. Pour one 12 oz bottle into the fuel tank and drive normally; one bottle treats 30-40 gallons of diesel. After the cleaning step, switch to AR6500 at every fill-up for ongoing protection and performance improvements. One 40 oz bottle treats up to 400 gallons of diesel fuel. Why it works: AR6400-D is a concentrated diesel fuel system cleaner designed for quick results - especially when response feels sluggish, idle becomes rough, or fuel economy (MPG) has dropped. AR6500 is the everyday diesel fuel additive that keeps improving fuel quality tank after tank with detergent cleaning, cetane boost (up to +8), and lubricity improvement (ASTM D6079 tested 43%) to help protect wear-sensitive components like the CP4 pump. Together, they support smoother running, improved response, more efficient combustion, and reduced deposit formation that improves turbo response and DPF function. For all diesel engines: Suitable for all diesel vehicles and equipment, including modern HPCR (high pressure common rail) systems. Ideal for light-duty and heavy-duty diesels such as pickups, SUVs, vans, RVs, work trucks, and diesel equipment.