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Mobil Delvac 1™ ESP 5W-40

Advanced full synthetic Heavy Duty Diesel Engine Oil

Since December 2016, Mobil Delvac 1™ ESP 5W-40 features a new CK-4 formulation. Get more information about PC-11 product changes.

Mobil Delvac 1™ ESP 5W-40 is an advanced synthetic heavy duty diesel engine oil that helps extend engine life while providing long drain capability and potential fuel economy for modern diesel engines operating in severe applications. This product is formulated to deliver exceptional performance in modern and older hard working engines, including those with emission control systems. Mobil Delvac 1 ESP 5W-40 is recommended for use in a wide range of heavy-duty applications and operating environments found in the on-road transport and off-road mining, forestry, construction, and agricultural industries.

The outstanding performance of Mobil Delvac ESP 5W-40 is the result of extensive cooperative development work with major equipment builders and application of the latest lubrication technology. As a result, this product meets or exceeds the requirements of the latest API and ACEA industry specifications for diesel engine oils, as well as the requirements of many major American, and European engine manufacturers.

Mobil Delvac 1 ESP 5W-40 maintains outstanding performance at significantly higher temperatures than other high performance diesel engine oils.  It also delivers exceptional low temperature fluidity and pumpability at low temperatures for smooth starting in cold down to -35°C.

Mobil Delvac 1 ESP 5W-40 is formulated with advanced synthetic basestocks to help improve fuel economy1.

FeaturesAdvantages and Potential Benefits
Meets or exceeds demanding specifications of major OEMsOne engine oil for mixed diesel fleet operations
Outstanding thermal and oxidation stabilityReduced low temperature sludge build-up and high temperature deposits
Enhanced film strength at high temperaturesReduced engine scuffing and bore polishing
Inherent stay-in-grade shear stabilityWear protection and reduced oil consumption; maintains viscosity in severe, high temperature service
Advanced formulation and viscometricsImproved fuel economy
Low volatilityReduced oil consumption
Exceptional low temperature pumpabilityEasy engine start-up and reduced wear
Enhanced TBN quality reserveDeposit control and extended drain capability
Outstanding resistance to corrosionExtended life of critical wear surfaces
Long drain capabilityIncreased operating efficiency and lower overall cost
Component compatibility Long gasket and seal life, extended service intervals
Low ash formulation meeting API CK-4 and CJ-4 requirementsLong emissions aftertreatment (DPF, DOC and SCR) life

1Compared to an SAE 15W-40 engine oil. Actual savings are dependent on vehicle engine type, outside temperature, driving conditions, and your current engine oil viscosity.


  • Recommended for the latest heavy duty diesel engines, including those equipped with aftertreatment systems and EGR.
  • Recommended for diesel applications using older and naturally aspirated conventional designs.
  • On-highway engines operating in both high speed/high load and stop-and-go conditions
  • Off-highway engines operating in severe low speed/heavy load conditions using up to 500 ppm sulfur fuels
  • Virtually all diesel powered equipment from American and European equipment builders
  • Refrigeration units

Mobil Delvac 1 ESP Meets or Exceeds the requirements of: 5W-40

API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4, SM, SN
ACEA E9-2016, E7-2016
Caterpillar ECF-3
Cummins CES 20086, 20081; JASO DH-2
Mobil Delvac 1 ESP is approved by the following OEMs: 5W-40
Detroit Fluids Specification 93K218
Mack EO-O Premium Plus
MAN M 3575
MTU Oil Category 2.1
Volvo VDS-4


Mobil Delvac 1 ESP 5W-40Value
SAE Grade5W-40
Viscosity, ASTM D 445 
cSt @ 40ºC81.8
cSt @ 100ºC13.56
Viscosity Index, ASTM D 2270170
Density @ 15.6ºC kg/L, ASTM D 40520.875
Pour Point, ºC, ASTM D 97-33
Flash Point, ºC, ASTM D 92222
Sulfated Ash, wt%, ASTM D 8741
Total Base Number, mg KOH/g, ASTM D 289612.1
CSS, cP, ASTM D 52936330 @ -30C
MRV, cP, ASTM D 468422000 @ -35C
HTHS @ 150ºC, cP, ASTM D46833.7