New 15W-40 semi truck engine oil

March 1, 2023

AMSOIL Commercial grade 15W40 diesel engine oil

Semi Truck Diesel Engine Oil

AMSOIL 15W-40 commercial-grade diesel engine oil is formulated with greater than 50% synthetic content, making it a more advanced blend when compared to conventional diesel oils. 

This oil is specially designed for commercial equipment, offering twice* the protection against wear and tear, so you can keep your trucks and machinery running at their maximum efficiency. Those looking to upgrade from traditional diesel oils will find that this AMSOIL® synthetic-blend diesel oil provides excellent value and superior protection.

*Detroit Diesel DD13 Scuffing test for specification DFS 93K222Detroit Diesel DD13 scuffing AMSOIL test results

  • Advanced synthetic-blend oil with greater than 50% synthetic base oil content
  • 2X better wear protection.*
  • Meets the latest API CK-4 diesel-oil specification.
  • Improved heat and oxidation resistance.
  • Helps maintain power and fuel efficiency.
  • Flows dependably in cold temperatures for reliable startup and engine protection.
  • Reduced oil consumption.


Semi-Truck 15W-40 Diesel engine oil data sheet

AMSOIL Commercial-Grade Diesel Oil is compatible with other conventional and synthetic oils. Mixing AMSOIL diesel oil with other oils however will reduce its performance benefits. Aftermarket oil additives are not recommended for use with AMSOIL diesel oils.

AMSOIL Commercial-Grade Diesel Oil is recommended for the drain intervals stated by the original equipment manufacturer (OEM). Refer to the owner’s manual for the specific oil change interval. Intervals may be extended beyond the OEM recommended interval with oil analysis.

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It takes time and energy to manage your on/off road equipment, make AMSOIL be your lubricant expert. AMSOIL can increase equipment life and reduce downtime on needless oil service maintenance. AMSOIL is a top quality oil, our oil analysis testing is the proof.

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