Archoil AR6500 Diesel Fuel Additive 40 oz — Treats 400 Gal, Lubricity & Injector Cleaner

Archoil AR6500 is a concentrated diesel fuel additive in a 40 oz bottle designed to treat up to 400 gallons, improving lubricity, cleaning injectors, and helping control deposits that affect DPFs and turbos.

AR6500 is formulated for modern diesel engines and fuel systems, including high-pressure common-rail units. It combines lubricity enhancement, powerful detergents, and cetane-boosting components to support smoother combustion, protect wear-prone parts, and help manage deposit build-up that can harm performance. The product is metered easily via its long neck and measuring chamber so you can add the correct dose at every fill-up.

How does AR6500 protect fuel system components?

AR6500 targets fuel shear and surface wear by improving lubricity and maintaining cleaner injectors. Better lubricity reduces friction in pumps and injectors, while detergents strip carbon and varnish that interfere with spray patterns.

• Tested to significantly improve lubricity per ASTM D6079 standards.
• Helps protect sensitive components such as CP4-style pumps and injectors.
• Limits metal-to-metal wear to extend component life.

Will this additive improve engine start-up and throttle response?

Yes—AR6500 raises cetane by several points, which promotes faster ignition and steadier combustion. That can translate to easier cold starts, reduced ignition lag, and smoother acceleration under load.

• Can boost cetane up to about +8 points depending on base fuel.
• Supports more complete combustion and steadier idle behavior.
• Helpful in engines that benefit from higher cetane, like older diesels or heavy-load applications.

Can this product reduce DPF regens and turbo deposits?

AR6500 includes deposit-control chemistry to limit soot and varnish formation that can foul DPFs and turbos. By maintaining cleaner injectors and reducing soot precursors, it helps support DPF performance and turbo responsiveness without promising guaranteed outcomes.

• Formulated to minimize deposit formation in exhaust aftertreatment systems.
• Aims to reduce the frequency of forced DPF regenerations by improving combustion quality.
• Helps keep turbocharger internals cleaner for steadier boost response.

How do I use the 40 oz bottle and how much fuel does it treat?

One 40 oz bottle is concentrated to treat up to 400 gallons of diesel when dosed as directed. The bottle features a long neck and measuring chamber so you can pour the correct amount directly into the tank at every fill-up for convenient routine maintenance.

• Pour directly into the fuel tank at each fill-up using the built-in measuring chamber.
• 40 oz treats up to 400 gallons—follow label dosing for exact ratios.
• Suitable for light- and heavy-duty vehicles, RVs, equipment, and HPCR systems.

Who this is for: Archoil AR6500 is aimed at diesel owners and operators who want a single, concentrated additive to address multiple fuel-related issues: improve lubricity to protect pumps and injectors, boost cetane for better ignition, and reduce deposit formation that impacts DPFs and turbos. It fits owners of passenger trucks, commercial fleets, agricultural and construction equipment, and anyone who prefers adding a treatment at fill-up to maintain fuel system cleanliness and performance.