Modern high output diesel engines including those using EGR technology generate higher levels of soot and run at higher temperatures than older, naturally aspirated engines, which significantly increases the demands on engine lubricants. These engine designs reduce oil consumption, resulting in less fresh oil makeup to replenish depleted additives. Top piston rings are located higher on the piston bringing the oil film closer to the combustion chamber where higher temperatures increase thermal stress on the lubricant.  Higher fuel injector pressure and retarded timing improve exhaust emission control, but also increase engine temperatures and increase soot loads, including those engines operating with EGR. The key benefits include:

Features Advantages and Potential Benefits
Outstanding thermal and oxidation stability Reduced low temperature sludge build-up and high temperature deposits
Extended TBN reserves Improved soot handling and extended drain intervals
Stay-in-grade shear stability Reduced oil consumption and wear protection Maintains viscosity in severe, high temperature service 
Excellent low temperature pumpability Easier engine start-up and reduced wear
Superb resistance to corrosion Longer life of critical wear surfaces


      Recommended by ExxonMobil for use in:

  • High performance diesel applications including pre-2007 turbo-charged, low emission engines designs, including those featuring EGR technology
  • 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.
  • High performance gasoline engines and mixed fleet operators
  • Diesel-powered equipment from American and Japanese OEMs
  • On highway heavy duty trucking and off highway including: construction, mining, quarrying, and agriculture


Mobil Delvac MX 15W-40 meets or exceeds the requirements of the following industry and builder specifications:  15W-40
API CI-4 PLUS, CI-4, CH-4 / SL, SJ X
Caterpillar ECF-2 X
Cummins CES 20078, 20077, 20076 X

Mobil Delvac MX has the following builder approvals:  15W-40
Volvo VDS-3 X
MAN M3275-1 X
Renault Trucks RLD-2 X
Detroit Fluids Specification 93K214            X
Mobil Delvac MX is recommended by ExxonMobil for use in applications requiring: 15W-40
Volvo VDS-2 X
Mack EO-M X
Cummins CES 20072, 20071 X
Detroit 7SE 270 (4-Stroke Cycle) X

Typical Properties

Mobil Delvac MX 15W-40  
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


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Why did you choose this?
The Lubricant Store Store
Pre 2007 diesel engine
Steve R on Apr 9, 2020
Old diesel equipment. Flat tappet cams. High in zinc
Tim F on Aug 15, 2018
Pre 2007 diesel engine
Steve R on Apr 9, 2020
Carlo Z on Nov 25, 2019
Old diesel equipment. Flat tappet cams. High in zinc
Tim F on Aug 15, 2018
Mobil makes a good product
Josh S on Dec 5, 2017
Carlo Z on Nov 25, 2019
Mobil makes a good product
Josh S on Dec 5, 2017