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Synthetic Diesel Motor Oils

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The full line of AMSOIL synthetic diesel oils withstands the punishment of modern and older hardworking turbo diesels. Model-year 2007 and newer diesels use diesel particulate filters (DPFs) and other exhaust-treatment devices to meet government emissions regulations. To function properly and last as designed, DPFs and exhaust-treatment devices require low-emissions oils that meet the API CJ-4 specification. Diesels built prior to 2007, however, can use any AMSOIL synthetic diesel oil of the correct viscosity.

AMSOIL Synthetic Diesel Oils for All Diesel Engines, including Model-Year 2007 and Newer

AMSOIL Premium Synthetic Diesel Oil

  • Maximum protection against wear, sludge and varnish
  • Designed to extend DPF service life
  • Premium turbocharger protection
  • Maximum fuel economy
  • Extended drain intervals up to 3x manufacturer recommendations, reducing maintenance and saving money
  • API CJ-4

AMSOIL OE Synthetic Diesel Oil

  • Guards against wear, sludge and varnish
  • Compatible with exhaust treatment devices and turbochargers
  • Maximum fuel economy
  • Lower initial price
  • Recommended for original equipment manufacturer drain intervals
  • API CJ-4

AMSOIL Synthetic Diesel Oil for Pre-2007 Diesel Engines

AMSOIL SAE 15W-40 Heavy Duty Diesel and Marine Motor Oil

  • Specifically designed for pre-2007 diesels without DPFs
  • High 12 TBN controls acids from combustion blow-by and exhaust gas recirculation
  • Helps control soot thickening, oxidation and wear
  • Maximum fuel economy
  • Extended drain intervals up to 3x manufacturer recommendations, reducing maintenance and saving money

AMSOIL Series 3000 SAE 5W-30 Synthetic Heavy Duty Diesel Oil

  • Low viscosity minimizes "drag" associated with high-viscosity oils, maximizing power and fuel economy
  • Outstanding protection against wear, sludge and varnish
  • Extended drain intervals up to 3x manufacturer recommendations, reducing maintenance and saving money

AMSOIL Synthetic SAE 10W-30/SAE 30 Heavy Duty Motor Oil

  • Exceeds 10W-30 multi-grade and SAE 30 straight-grade viscosity requirements for maximum convenience in a variety of applications
  • Guards against engine wear and neutralizes acids from exhaust gas recirculation and high-sulfur diesel fuels
  • Extended drain intervals up to 3x manufacturer recommendations, reducing maintenance and saving money
See all of the AMSOIL Products for Diesel Applications