Skip to main content
mobil delvac mx diesel engine oil

Mobil Delvac MX™

High-performance diesel engine oil

Mobil Delvac MX is a high-performance diesel engine oil that helps extend engine life in severe on- and off-highway applications. Mobil Delvac MX meets or exceeds the API CI-4 PLUS service category.

Mobil Delvac MX also meets or exceeds the API SL specification for gasoline engines and mixed fleets. 

It is recommended by ExxonMobil for use in:

  • High-performance diesel applications, such as pre-2007 turbocharged, low emission engine designs, including those featuring exhaust gas recirculation (EGR) technology
  • Modern, high-output engines with EGR
  • Older engines operating on either low or high sulfur fuels
  • On-highway applications operating in both high-speed/high-load and short-haul, pick-up/delivery
  • Off-highway applications operating in severe low-speed/heavy-load conditions
  • Modern marine high-speed diesel engines, including Caterpillar, Cummins, Volvo, Daihatsu and Yanmar
  • Demanding diesel engines of Caterpillar, Cummins, Detroit Diesel, Mack, Mercedes-Benz, Navistar, Volvo and others
  • High-performance gasoline engines and mixed fleet operators
  • Diesel-powered equipment from American and Japanese original equipment manufacturers
  • On-highway heavy-duty trucking and off-highway, including construction, mining, quarrying and agriculture

The outstanding performance reserve of Mobil Delvac MX is the result of extensive cooperative development work with major original equipment manufacturers (OEMs) and advanced additive chemistry with patented Trimer technology. These enhancements assure excellent control of oil thickening due to soot buildup and exposure to higher temperatures, and provide outstanding resistance to oxidation, corrosion, wear and high-temperature deposits.

Features and benefits

  • Excellent thermal and oxidation stability helps reduce engine deposits and sludge build up to keep engines running reliably
  • Effective TBN reserve to neutralize corrosive acids and control deposits
  • Stay-in-grade shear stability maintains viscosity in severe, high temperature service, provides wear protection and helps retain oil consumption
  • Effective detergency/dispersancy keeps engine cleaner helps prolong engine life
  • Excellent low temperature properties enables easy startup circulation and helps keep engine clean, which can prolong engine life

Available viscosity grades

What does this viscosity mean?
  • 15W-40

    Specifications and approvals

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

    • API CI-4 PLUS, CI-4, CH-4, SL, SJ
    • Caterpillar ECF-2
    • Cummins CES 20078/20077/20076

    Mobil Delvac MX 15W-40 has the following builder approvals:

    • Mack EO-M Plus
    • MB-Approval 228.3
    • Volvo VDS-3
    • MAN M 3275-1
    • RVI RLD-2

    Mobil Delvac MX 15W-40 is recommended by ExxonMobil for use in applications requiring:

    • API CG-4, CF
    • Mack EO-M
    • ZF TE-ML04C
    • Cummins CES 20072/20071
    • Detroit Diesel 7SE 270 (4-Stroke Cycle)
    • ACEA E5
    • Volvo VDS-2

    Technical details

    SAE Grade 15W-40
    Viscosity, ASTM D 445
    cSt @ 40ºC 123
    cSt @ 100ºC 15.6
    CCS, cP, ASTM D 5293 6000 @ -20ºC
    MRV, cP, ASTM D 4684 29,000 @ -25°C
    HTHS @ 150ºC, cP, ASTM D4683 4.3
    Viscosity Index, ASTM D 2270 133
    Sulfated Ash, wt%, ASTM D 874 1.3
    Total Base #, mg KOH/g, ASTM D 2896         12
    Pour Point, ºC, ASTM D 97 -30
    Flash Point, ºC, ASTM D 92 230
    Density @ 15ºC kg/l, ASTM D 4052 0.879


Related products

Engine oils

Our oils can help to achieve long engine life with extended service intervals.


Heavy-duty grease

Protect hardworking parts from temperature extremes, rust and wear.


Transmission fluids

Get excellent protection against high temperature and high-speed wear.

More Mobil™ resources

Mechanic checking diesel engine oil

Mobil Delvac™ FAQs

Find answers to your product questions and more in our FAQs.

American trucker Hamilton Williams smiling with Mobil Delvac hat on close up

Behind the Wheel videos

Discover the stories of American truckers who face difficult challenges but share a trust for Mobil Delvac™ diesel engine oil.

Mobil Delvac find products distributor locator

Find a distributor near you

Use our locator tool to find out where to buy Mobil Delvac™ products near you.