AMSOIL introduced the world's first Synthetic Motor oil for Diesel Engines in 1975 and dramatically redefined the performance and protection available to diesel owners.
Today, AMSOIL is the recognized leader in synthetic lubricant technology and offers a variety of exclusive synthetic diesel oil formulations, each tailored to meet the unique demands of modern, hard-working diesel engines.
Independent testing shows AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides 6X more wear protection than required by the standard*. In the same test, AMSOIL Heavy-Duty Synthetic Diesel Oil delivers 4X more protection against wear than required by Detroit Diesel’s standard*.
AMSOIL CI-4+ Synthetic Diesel Oils. Engineered for pre-2007 diesel engines in on-road applications and provides outstanding performance in all model year diesel engines in off-road applications. Also recommended for gasoline engines requiring API SL or previous specifications.