Signature Series Max-Duty Synthetic Diesel Oil 5W-40


Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:
API CK-4/SN, CJ-4, CI-4+, CF MB 228.31
Volvo VDS4.5, VDS4, VDS3 MAN 3575
Mack EOS-4.5, EO-O MTU Type 2.1, II, I
Renault RLD-4, RLD-3 JASO DH-2
Cummins CES20086, CES20081 Allison TES439
Caterpillar ECF-2, ECF-3, ECF-1-a Deutz DQC III-10LA
DDC 93K218, 93K215, 93K214 Scania LA-2
DFS 93K222 Chrysler MS 10902
ACEA E9, E7 Ford WSS-M2C171-F1


Maximum Engine Protection

Wear on rings and cylinder liners leads to increased oil consumption and loss of compression, resulting in reduced horsepower and fuel economy. Independent testing shows AMSOIL Signature Series Max-Duty delivers 6X more wear protection*, delivering the security of providing your diesel the extra protection it deserves.

*Based on independent testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using a 5W-30 as worst-case representation.

Viscosity Control

Using top-tier synthetic base oils, AMSOIL Signature Series Max-Duty is naturally resistant to oxidation and the thickening effects of soot contamination. That, along with boosted detergent/dispersant additives, keeps soot particles suspended independently, helping prevent the formation of larger, wear-causing particles. Viscosity increase is minimized and soot-related wear is controlled. Lower volatility also helps Signature Series Max-Duty retain its viscosity after high-temperature service for maximum engine protection and efficiency.

Excels in Extreme Temperatures

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils. Unlike conventional oils, Signature Series contains no wax, staying fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear.

Minimizes Oil Consumption

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

Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222

Oil Consumption


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