AMSOIL Diesel Oils | AMSOIL Synthetic Motor Oil
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Top Grade Protection for Trucks and Equipment

Diesel Motor Oils

AMSOIL synthetic diesel oils are formulated with premium synthetic technology and robust additive packages, providing vehicles and equipment with the protection they need to stay on the job longer and perform their best.

Max Duty

Signature Series Max-Duty Synthetic Diesel Oil


6X better wear protection*

Formulated with top-grade synthetic technology and maximum additive fortification, AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides 6X better wear protection than required by a leading engine manufacturer’s standard* – it’s protection boosted to the max.

  • Max-Duty protection against wear
  • Significantly exceeds industry requirements
  • Full specification coverage
  • Reduced oil consumption
  • Extended drain intervals
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*than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222
Heavy Duty

Heavy-Duty Synthetic Diesel Oil


4x better wear protection*

We engineered AMSOIL Heavy-Duty Synthetic Diesel Oil to provide 4X better wear protection than required by a leading engine manufacturer’s standard*, giving you the edge to keep trucks and equipment on the job longer.

  • Heavy-duty protection against wear
  • Reduced oil consumption
  • Excels in extreme temperatures
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*than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222
Heavy-Duty

CI-4+ Synthetic Diesel Oils


The AMSOIL CI-4+ synthetic diesel oil lineup provides additional high-quality options for pre-2007 diesel applications not equipped with diesel particulate filters (DPF).

  • Help control soot thickening, oxidation and wear
  • Control acids from combustion blow-by and exhaust gas recirculation
  • Extended drain intervals
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