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

Product code: DMEQT-EA

Outstanding extreme-pressure protection
• Delivers 6X more wear protection1
• Maintains proper viscosity (thickness)
• Minimizes oil consumption
• Maximizes fuel efficiency
• Excels in extreme temperatures
• Confidently extend drain intervals

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Availability and Price subject to AMSOIL stock, visit product's page for updated information.


  • Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:
    • API CK-4/SN, CJ-4, CI-4+, CF
    • API CF-2
    • Volvo VDS4.5, VDS4, VDS3
    • 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
    • MTU Type 2.1, II, I
    • JASO DH-2
    • Allison TES439
    • Deutz DQC III-10LA
    • Scania LA-2
    • Chrysler MS 10902 
    • Ford WSS-M2C171-F1

  • Signature Series Max-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will shorten the oil’s life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

    Aftermarket oil additives are not recommended for use with AMSOIL synthetic diesel oils.
  • Diesel Engine Service Life

    Heavy-Duty On-/Off-Road: Three times (3X) OEM1 recommendation, not to exceed 60,000 miles/600 hours or one year, whichever comes first.
    Turbodiesel Pickup: Two times (2X) OEM1 recommendation, not to exceed 25,000 miles or one year, whichever comes first.
    Competition Service Life: Provides lasting protection for multiple events. Use oil analysis to determine appropriate drain intervals.

    Drain intervals may be extended further with oil analysis.

    Note: Extended drain intervals are not recommended for performance-modified engines, when using biofuels containing more than 10 percent ethanol or 15 percent biodiesel (B15) or for 2007-2009 Caterpillar* C13 and C15 on-highway engines. Extend drain intervals beyond OEM recommendations in these instances only with oil analysis. Note: 2007-2010 Dodge**, Ford** and GM** turbodiesel pickups are also not recommended for extended drain intervals when using Signature Series Max-Duty 5W-30 Diesel Oil (DHD).
    1 Refer to your owner’s manual for OEM drain interval recommendations and guidelines for severe and normal service.

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