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Max-Duty Synthetic Diesel Oil 5W-40

Product code : AIOQT-EA

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 more wear protection,* delivering the extra protection your diesel deserves. 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.

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


  • 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.
  • 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

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