AMSOIL Heavy-Duty Diesel Oil

AMSOIL Heavy-Duty Diesel Oil is developed to provide protection beyond conventional, synthetic-blend, and other synthetic oils. AMSOIL synthetic technology delivers heavy-duty protection for diesel enthusiasts and those who depend on their trucks and equipment to make a living. Signature Series synthetic technology delivers max-duty protection in on- and off-road applications. AMSOIL diesel oil delivers powerful engine protection. How good is it? AMSOIL Synthetic Heavy-Duty Diesel Oil delivers up to 6X more wear protection and up to 60 percent better turbo cleanliness. It also provides up to 2X better rust protection. In third-party testing compared to a leading brand, AMSOIL provided long-lasting wear protection, keeping cylinder liners looking like new. AMSOIL provides heavy-duty protection so you can work your diesel equipment with peace of mind.


  • Delivers up to 6X more wear protection
  • Helps maximize equipment life
  • Helps keep trucks and equipment operating at peak performance
  • Minimizes oil consumption
  • Helps reduce maintenance costs and downtime
  • Offers outstanding value

Delivers More Wear Protection

Third-party testing shows Heavy-Duty Synthetic Diesel Oil delivers 4X more protection against wear than required by Detroit Diesel’s* standard.


  • Resists oxidation and the thickening effects of soot contamination
  • Retains viscosity after high-temperature service for added engine protection and increased fuel economy
  • Provides up to 66 percent less oil consumption


  • Provides outstanding protection and performance in hot and cold temperature extremes
  • Delivers improved heat and oxidation resistance compared to conventional diesel oils
  • Flows dependably in cold temperatures for easier startup and improved engine protection