In a head-to-head comparison, Series 3000 provided better wear protection than Delvac 1, Delo 400, Rotella T, and Valvoline Premium Blue. Independent laboratory testing shows up to 40 percent less wear with Series 3000 than with the other oils tested.

AMSOIL Series 3000 100% Synthetic 5W-30 Diesel Oil (HDD) delivers extraordinary lubrication in both diesel and gasoline engines found in commercial, fleet and personal vehicles. By combining the industry's premier synthetic technology with AMSOIL premium additives, AMSOIL HDD exceeds the higher performance demands of modern engines. It withstands the stress of higher heat, higher acid levels and excessive soot loading found in EGR equipped engines. AMSOIL Series 3000 Synthetic 5W-30 Diesel Oil consistently outperforms conventional and synthetic diesel oils for long-lasting performance and protection.

AMSOIL Synthetic 5W-40 (DEO) is the premium choice for API CJ-4 emission quality diesel oil required by model year 2007 and newer diesel engines. It exceeds the higher performance demands of modern engines and withstands the stress of heat, soot and acids to help prevent deposits, corrosion and wear. AMSOIL Synthetic 5W-40 exceeds emission system requirements, controls soot thickening and wear, maximizes fuel economy and excels in extreme temperatures.

AMSOIL Synthetic Heavy-Duty Diesel and Marine 15W-40 Motor Oil (AME) and AMSOIL Synthetic Blend 15W-40 Motor Oil (PCO) have been put to the test over millions of miles in heavy-duty trucks.

They are proven to provide unsurpassed engine protection, even when they are used much longer than conventional diesel oils are used. Numerous tests have proven that AMSOIL maintains its protective TBN and viscosity while petroleum products rapidly lose both. More to the point, AMSOIL keeps engine wear rates low, an important factor in ensuring long engine life.