AMSOIL Diesel Additive Dosage Calculator

Over-treating is mostly a wallet problem, not an engine problem. At modest over-rates you're not going to damage anything — you're just burning through product faster than necessary. Under-treating is the bigger functional concern: you're not getting the cetane boost, injector protection, or cold flow coverage you're paying for. Dose precisely and you get maximum value per bottle. The calculator on this page is built specifically for this — enter your exact tank size and it outputs the correct dose.

Add the additive directly to your tank before filling up — this ensures thorough mixing as fuel is pumped in. Use the dosage calculator at the top of this page to determine the right amount for your tank size and product. Treat every fill for best results. One-time cleanup doses (ADF at double strength) are only for the first treatment on a neglected injector system — after that, drop back to the maintenance rate every tank.

For a 100-gallon diesel tank: ACB Cetane Boost requires 20 oz at the standard 1 oz per 5 gallons. ADF Injector Clean requires 25 oz at 1 oz per 4 gallons maintenance rate. ADB All-In-One requires 20 oz. ACFD Cold Flow Improver requires 20 oz standard, or 40 oz in extreme cold below 0°F / −18°C. Use the interactive calculator at the top of this page for any tank size in gallons or litres.

AMSOIL Diesel Cold Flow Improver (ACFD) is the dedicated cold-weather formula — it depresses the cold filter plug point and prevents wax crystal formation in diesel fuel down to −40°F (−40°C) at double dose. For year-round Canadian operation, AMSOIL Diesel All-In-One (ADB) covers cold flow protection alongside cetane boost and injector cleaning in a single product. In regions with extreme cold below −18°C, running ACFD alongside ADB provides maximum protection — these two products are compatible with each other.

For best results, yes. Consistent treatment maintains injector cleanliness, stable cetane, and proper lubricity year-round. AMSOIL formulates its diesel additives for every-fill use at the maintenance dose. One-time cleanup doses (double strength) are for the first treatment on a neglected injector system — after that, drop back to the maintenance dose every tank.

ACB (Diesel Cetane Boost) — raises cetane by up to 8 points. Improves ignition, reduces noise and smoke, and can improve fuel economy through more complete combustion.

ADF (Diesel Injector Clean) — specifically targets internal diesel injector deposits (IDIDs) that rob power and fuel economy. Best used for cleanup on high-mileage or neglected injectors.

ADB (Diesel All-In-One) — combines cetane boost, injector cleaning, cold flow, and lubricity in one bottle. Best single-product choice for year-round maintenance.

ACFD (Cold Flow Improver) — winter specialist. Depresses pour point and cold filter plug point to prevent fuel gelling in cold climates. Use seasonally in Canada and northern U.S.

Yes — and it's well-documented. AMSOIL Diesel Cetane Boost raises cetane number by up to 8 points in third-party testing. Higher cetane means faster ignition, shorter combustion delay, more complete burn, less unburned fuel and soot, reduced knock, quieter starts, and measurable fuel economy improvements in most duty cycles. The effect is most noticeable with low-cetane pump diesel (common in Canada and parts of the U.S.) and in cold weather where combustion is already challenged.

Yes — AMSOIL diesel additives are compatible with biodiesel blends up to B20. At higher biodiesel concentrations, verify compatibility with AMSOIL's technical documentation. Cold Flow Improver (ACFD) effectiveness decreases with biodiesel content above B5 because FAME (fatty acid methyl ester) components gel at different temperatures than petroleum diesel wax crystals.

Yes — AMSOIL diesel fuel additives are formulated to be compatible with diesel particulate filters (DPF), selective catalytic reduction (SCR) systems, and diesel oxidation catalysts (DOC). They are ashless and sulfur-free, which is critical for modern emissions systems. Using injector cleaners and cetane boosters on high-mileage emissions-equipped trucks can actually reduce particulate loading on the DPF by improving combustion efficiency.