Mobil Delvac™ Extreme FE

Premium synthetic blend diesel engine oil

Mobil Delvac™ Extreme FE 10W-30 is a premium synthetic blend, high-performance diesel engine oil that helps extend engine life while providing long drain capability for modern diesel engines operating in extreme conditions. It meets or exceeds the new API FA-4 specification for fuel-efficient engine oils, as well as key original equipment manufacturer (OEM) requirements.

Developed in close collaboration with major OEMs, Mobil Delvac Extreme FE 10W-30 engine oil is recommended for use in the extreme applications and operating conditions found in the on-road trucking industry. Its boosted formulation provides:

  • Potential to improve fuel economy*
  • Exceptional oxidation stability
  • Excellent soot and viscosity control
  • Excellent oil consumption control

Mobil Delvac Extreme FE 10W-30 engine oil should only be used where an API FA-4 oil is recommended by the OEM. Before using this product in an engine, users should consult recommendations as shown in the owner’s manual or other service bulletins.

Mobil Delvac Extreme FE 10W-30 engine oil is recommended by ExxonMobil for use in:

  • The latest heavy-duty diesel engines operating in extreme applications, where API FA-4 is recommended by the engine builder/OEM
  • Engines equipped with emission control systems, including exhaust aftertreatment systems
  • On-highway applications operating in both high-speed/high-load conditions and short haul pick-up/delivery

*Meets API FA-4 specification.
Based on measured viscosity increase in the Volvo T-13 test.


Features and benefits

  • Formulated with a blend of synthetic base stocks and a boosted additive system tailored to deliver extended oil drain interval (ODI) potential up to 2X the average OEM ODI recommendation
  • Outstanding resistance to oil consumption, oxidation, corrosive and abrasive wear, and high-temperature deposits
  • 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

Average OEM ODI recommendation based on recommended oil drain intervals from major U.S. engine manufacturers using API CJ-4 oils for a variety of service severity levels and engine models. Average OEM ODI API CJ-4 recommendation to substantiate multiplier claims is 31,750 miles. Results may vary based on vehicle/engine condition, driving and environmental conditions. Consult OEM or ExxonMobil before implementing extended ODIs, especially if the equipment/vehicle is under the OEM’s warranty.

Specifications, approvals and technical details

Specifications and approvals  

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

  • API FA-4
  • Cummins CES 20087
  • JASO DH-2

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

  • Detroit Fluids Specification 93K223

Technical details  

SAE Grade 10W-30
Viscosity, ASTM D 445  
cSt @ 40ºC 63.8
cSt @ 100ºC 10
CCS, cP, ASTM D 5293 5,350 @ -25ºC
MRV, cP, ASTM D 4684 13,400 @ -30ºC
HTHS @ 150ºC, cP, ASTM D 4683 3.1
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 92 215
Density @15ºC kg/l, ASTM D 4052 0.865

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

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