Click to edit me!
AMSOIL first in synthetics
Gerry Reid

Raleigh & Zebulon, NC

CALL (888) 450-2658

Signature Series Max-Duty Synthetic Diesel Oil 15W-40

Protect your investment in diesel power and confidently extend drain intervals with our top-grade synthetic diesel oil. AMSOIL Signature Series Max-Duty Synthetic Diesel Oil delivers 6X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that’s boosted to the max.

Maximum-duty protection for your 

hardest-working diesel engines

Signature Series Max-Duty Synthetic Diesel Oil 15W-40

Five StarsFive Stars Product

  • 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.
  • Propylene Glycol Antifreeze & Coolant is formulated for use in ALL domestic and import passenger cars and light trucks and designed to meet the following heavy-duty specifications:
    • API CK-4/SN, CJ-4, CI-4+, CF
    • Volvo VDS4.5, VDS4, VDS3
    • Allison TES-439Chrysler MS7170
    • Mack EOS-4.5, EO-O
    • Renault RLD-4, RLD-3
    • Cummins CES20086, CES20081
    • Caterpillar ECF-2, ECF-3, ECF-1-a
    • DDC 93K218, 93K215, 93K214
    • DFS 93K222
    • ACEA E9, E7
    • MB 228.31
    • MAN 3575
    • JASO DH-2
    • Deutz DQC III-10LA
    • Scania LA-2
    • Chrysler MS 10902
    • Ford WSS-M2C171-F1

Utimate protection for your hard-working diesel engine

Other Customers also bought

  Signature Series Max-Duty Synthetic Diesel Oil 5W-40
Signature Series Max-Duty Synthetic Diesel Oil 10W-30
Signature Series Max-Duty Synthetic Diesel Oil 0W-40