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Minimum wear to diesel cylinder liners and rings leads to increased oil consumption and loss of compression, reducing horsepower and fuel economy. Less oil change service along with Max Protection for Wear.

Signature Series Max-Duty Synthetic Diesel Oil

4x better wear protection*

AMSOIL Heavy-Duty Synthetic Diesel Oil  is engineered 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

Diesel Engine Oil

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

Heavy-Duty Synthetic Diesel Oil

Top Grade Protection for Trucks and Equipment

6X better wear protection*

Diesel Motor Oil / Engine Oil Formulated with top-grade synthetic technology and maximum additive fortification, Signature Series Max-Duty Synthetic Diesel Engine 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

CI-4+ Synthetic Diesel Oils