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Mobil Delvac™ Extreme 10W-30 diesel engine oil with CK-4 identifier

Mobil Delvac™ Extreme

Premium synthetic blend diesel engine oil

Mobil Delvac™ Extreme, formerly Mobil Delvac™ Elite, features a new CK-4 formulation. Get more information about PC-11 product changes.

Mobil Delvac™ Extreme 10W-30 and 15W-40 are premium synthetic blend, high-performance diesel engine oils that help extend engine life while providing long drain capability for modern diesel engines operating in extreme conditions. They are recommended for use in a wide range of heavy-duty applications and operating environments found on- and off-highway, including engines operating under heavy loads.

Fully backward compatible, Mobil Delvac Extreme engine oils deliver exceptional performance in both newer and older heavy-duty engines. Their boosted formulation provides:

  • Unsurpassed oxidation stability*
  • Superior engine protection
  • Excellent anti-wear performance
  • Excellent soot and viscosity control

Mobil Delvac Extreme engine oils deliver updated high-temperature performance under the extreme operating environments found in the trucking, mining, construction and agricultural industries. Accordingly, these oils meet or exceed the requirements of API CK-4, CJ-4, CI-4 PLUS, CI-4 and CH-4 service categories, as well as key original engine manufacturer (OEM) requirements.

Mobil Delvac Extreme diesel engine oils are recommended by ExxonMobil for use in:

  • Modern, high-performance diesel engines with exhaust gas recirculation (EGR), after treatment systems with diesel particulate filters (DPFs) and diesel oxidation catalysts (DOCs)
  • Naturally aspirated and turbocharged, diesel-powered engines
  • On-highway light- and heavy-duty trucking, including mixed fleets
  • Off-highway industries, including mining, construction, quarrying and agriculture

*Based on performance in the Volvo T-13 engine test.

Features and benefits

  • Excellent oxidation performance that helps reduce engine deposits to keep engines running reliably
  • Excellent anti-wear and anti-scuff properties help control wear in heavy-duty operation to help promote long engine life
  • Excellent low-temperature performance allows for increased oil flow to critical bearing surfaces at startup and controls low-temperature sludge formation in stop-and-go service
  • Stay-in-grade shear stability maintains viscosity in severe, high-temperature service, provides wear protection and helps reduce oil consumption
  • Excellent protection against oil thickening and degradation contributes to long drain interval capability, helping to reduce the number of oil changes and oil disposal needs

Available viscosity grades

What does this viscosity mean?
  • 10W-30

    Specifications and approvals

    Mobil Delvac Extreme 10W-30 engine oil meets or exceeds the requirements of:

    • API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4
    • ACEA E9, E7
    • Caterpillar ECF-3
    • Cummins CES 20086, 20081
    • JASO DH-2

    Mobil Delvac Extreme 10W-30 engine oil is approved by the following OEMs:

    • Detroit Fluids Specification 93K222, 93K218
    • Deutz DQC II-10 LA
    • Mack EOS-4.5, EO-O Premium Plus
    • MB-Approval 228.31
    • Renault Trucks RLD-4, RLD-3
    • MAN M 3575
    • Volvo VDS-4.5, VDS-4

    Technical details

    Viscosity, ASTM D 445
    cSt @ 40ºC 81.1
    cSt @ 100ºC 11.8
    CCS, cP, ASTM D 5293 6,600 @ -25ºC
    MRV, cP, ASTM D 4684 18,400 @ -30ºC
    HTHS @ 150ºC, cP, ASTM D 4683 3.6
    Viscosity Index, ASTM D 2270 140
    Sulfated Ash, wt%, ASTM D 874 1
    Total Base Number, mg KOH/g, ASTM D 2896         10.3
    Pour Point, ºC, ASTM D 97 -42
    Flash Point, ºC, ASTM D 92 219
    Density @15ºC kg/l, ASTM D 4052 0.867

    View product data sheet for Mobil Delvac™ Extreme 10W-30 engine oil


  • 15W-40

    Specifications and approvals

    Mobil Delvac Extreme 15W-40 engine oil meets or exceeds the requirements of:

    • API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4
    • ACEA E9, E7
    • Caterpillar ECF-3
    • Cummins CES 20086, 20081
    • JASO DH-2

    Mobil Delvac Extreme 15W-40 meets or exceeds the following industry and/or builder specifications:

    • Allison TES 439
    • Detroit Fluids Specification 93K222, 93K218
    • Deutz DQC II-10 LA
    • Mack EOS-4.5, EO-O Premium Plus
    • MB-Approval 228.31
    • MTU Oil Category 2.1
    • Renault Trucks RLD-4, RLD-3
    • MAN M 3575
    • Volvo VDS-4.5, VDS-4

    Technical details

    SAE Grade 15W-40
    Viscosity, ASTM D 445
    cSt @ 40ºC 107.4
    cSt @ 100ºC 14.3
    CCS, cP, ASTM D 5293 6,100 @ -20ºC
    MRV, cP, ASTM D 4684 16,900 @ -25ºC
    HTHS @ 150ºC, cP, ASTM D 4683 4.1
    Viscosity Index, ASTM D 2270 140
    Sulfated Ash, wt%, ASTM D 874 1
    Total Base Number, mg KOH/g, ASTM D 2896         10.3
    Pour Point, ºC, ASTM D 97 -33
    Flash Point, ºC, ASTM D 92 221
    Density @15ºC kg/l, ASTM D 4052 0.872

    View product data sheet for Mobil Delvac™ Extreme 15W-40 engine oil



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Engineered for extreme conditions

Mobil Delvac™ Extreme engine oils feature a boosted formulation that provides excellent engine protection – even in extreme conditions.

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