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.

HEAVY-DUTY ENGINE PROTECTION

• Delivers 4X more wear protection1
• Helps maximize equipment life
• Helps reduce maintenance costs and downtime

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.I

VISCOSITY CONTROL

• 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

Reduces Oil Consumption

Heavy-Duty Synthetic Diesel Oil provides up to 66% less oil consumption.

EXCELS IN EXTREME TEMPERATURES

• 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