Synthetic engine lubricants from AMSOIL are synonymous with power and performance. They are reliable and withstand the destructive effects of long service intervals and heavy towing that destroy conventional lubricants. By reducing friction and protecting against wear, AMSOIL synthetic lubricants increase fuel economy and help maintain vehicles at work, saving you money.

• Protect against engine wear
• Combat performance-robbing deposits
• Aid in controlling soot

Maximum engine protection

Wear of piston rings and cylinder liners leads to increased oil consumption and compression loss, resulting in reduced horsepower and fuel economy. Independent testing shows that the AMSOIL Signature Series Max-Duty line offers 6 times greater wear protection, providing your diesel with the additional protection it deserves.

Viscosity control

Using synthetic base oils, AMSOIL Signature Series Max-Duty is naturally resistant to oxidation and the thickening effects of soot contamination. This, along with enhanced detergent/dispersant additives, keeps suspended particles independent, helping prevent the formation of larger particles that cause wear. Increased viscosity is minimized and wear due to soot is controlled. The lower volatility also helps the Signature Max-Duty line maintain its viscosity after high temperatures for maximum engine protection and performance.

Excels in extreme temperatures

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil withstands thermal breakdown better than conventional and competing synthetic diesel lubricants. Unlike conventional lubricants, the Signature line does not contain wax, remaining fluid at temperatures below zero for easier starting, improved oil flow, and reduced wear.

Minimizes oil consumption

AMSOIL Signature Series Max-Duty has low volatility (burn-off), reducing oil consumption during operation and passing fewer vapors into the combustion chamber. It provides up to 76% less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.