AMSOIL offers 5W-30, 5W-40, 15W-40 and 10W-30/SAE 30 viscosity grade synthetic oils and a 15W-40 grade synthetic blend oil for stationary and mobile diesel engines. All are formulated with 12 TBN (Total Base Number) chemistry for durable corrosion control. Superior stability in terms of volatility, thermal degradation, oxidation, viscosity retention and TBN retention make AMSOIL synthetic diesel oils ideal for extended drain interval use.

Premium API CJ-4 Synthetic 5W-40 Diesel Oil (DEO) – The premium choice diesel oil for model-year 2007 and newer heavy-duty and pickup truck diesel engines requiring API CJ-4 emission-quality oil standards. Delivers extraordinary lubrication in diesel engines in commercial, fleet and personal applications. Exceeds modern specs for emission-quality diesel oil.

Premium API CJ-4 Synthetic 15W-40 Diesel Oil - The premium choice diesel oil for model-year 2007 and newer heavy-duty and pickup truck diesel engines requiring API CJ-4 emission-quality oil standards. Delivers extraordinary lubrication in diesel engines in commercial, fleet and personal applications. Exceeds modern specs for emission-quality diesel oil.

SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil – Engineered for pre-2007 diesel engines in on-road applications as well as all model year diesel engines in off-road applications. High 12 TBN controls acids from combustion blow-by and EGR. Additives control soot thickening, oxidation and wear. Extended drain capabilities reduce downtime and motor oil expenses.

Series 3000 SAE 5W-30 Synthetic Heavy Duty Diesel Oil – Engineered for pre-2007 diesel engines in on-road applications as well as all model year diesel engines in off-road applications. Also engineered for all gasoline engines recommending API SL specifications including turbo-charged vehicles. Provides superior wear protection and fuel efficiency.

SAE 15W-40 Synthetic Blend Diesel Oil – Engineered for pre-2007 diesel engines in on-road applications as well as all model year diesel engines in off-road applications. High 12 TBN controls acids from combustion blow-by and EGR. Additives control soot thickening, oxidation and wear. Extended drain capabilities reduce downtime and motor oil expenses.

Synthetic SAE 10W-30/SAE 30 Heavy-Duty Motor Oil – Exceeds both 10W-30 multi-grade and SAE 30 straight-grade viscosity requirements. Provides outstanding performance in pre-2007 diesel engines in on-road applications as well as all model-year diesel engines in off-road apps. Also recommended for gasoline engines requiring API SL or previous specifications.