Mobil Delvac™ Extreme FE 10W-30

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

Mobil Delvac™ Extreme FE 10W-30 is a premium synthetic, 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 engines oils as well as key original equipment manufacturer (OEM) requirements.


Mobil Delvac Extreme FE is a boosted formulation designed for extended oil drain service and operations in extreme conditions. Developed in close collaboration with major OEMs, it is recommended for use in the extreme applications and operating environments found in the on-road trucking industry.


Mobil Delvac Extreme FE 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 an owner's manual or other service bulletins.


Features and Benefits

Mobil Delvac Extreme FE is formulated with a blend of synthetic basestocks and a boosted additive system tailored to deliver extended performance for up to two times beyond OEM recommended oil drain intervals¹. The proprietary formulation delivers excellent wear protection, unsurpassed oxidation stability², and outstanding TBN retention. Mobil Delvac Extreme FE also provides outstanding resistance to oil consumption, oxidation, corrosive and abrasive wear, and high temperature deposits.


Mobil Delvac Extreme FE is engineered to provide greater potential fuel economy benefits than typical SAE 10W-30 oils³ .


The key benefits include:


Advantages and Potential Benefits

Potential to improve fuel economy³

Engineered to provide greater potential fuel economy benefits than typical SAE 10W-30 oils.

Unsurpassed oxidation stability²

Superior performance in extreme conditions and extended ODI service¹.

Excellent soot and viscosity control

Greater engine efficiency, long engine life and long oil life

Excellent oil consumption control

Lower oil costs due to less make-up oil during operation

Outstanding TBN reserves

Corrosion protection and extended drain intervals for both new and old engines using up to 500 ppm sulfur diesel fuel.

Low temperature fluidity and pumpability

Formulated for smooth starting in cold weather

Resistance to corrosive and abrasive wear

Long life of critical wear surfaces

Component compatibility

Long gasket and seal life

Meets demanding specifications of key diesel OEMs

One engine oil for mixed diesel fleets

Low ash formulation meeting API FA-4 requirements

Long emissions aftertreatment (DPF, DOC and SCR) life

 ¹ Results may vary based on vehicle/engine condition, driving and environmental conditions Consult OEM or ExxonMobil before implementing extended ODIs.

 ² Based on performance in the Volvo T-13 engine test

 ³ Meets API FA-4 specification



     •  Formulated 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 exhaust aftertreatment systems.

     •  On-highway applications operating in both high speed/high load and short haul pick-up/delivery.


Specifications and Approvals

This product is approved by the following OEMs:

Detroit Detroit Fluids Specification 93K223


This product meets or exceeds the requirements of:


Cummins CES 20087



Properties and Specifications




SAE 10W-30

Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Viscosity Index, ASTM D2270


Density @ 15 C, g/ml, ASTM D1298


Pour Point, °C, ASTM D97


Flash Point, Cleveland Open Cup, °C, ASTM D92


Ash, Sulfated, mass%, ASTM D874


Total Base Number, mgKOH/g, ASTM D2896


Cold-Cranking Simulator, Apparent Viscosity @ -25 C, mPa.s, ASTM D5293


Mini-Rotary Viscometer, Apparent Viscosity, -30 C, mPa.s, ASTM D4684


Hi-Temp Hi-Shear Viscosity @ 150 C 1x10(6) sec(-1), mPa.s, ASTM D4683



Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @