Mobil Delvac Extreme 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 10W-30 has the potential to improve fuel economy2.

Features Advantages and Potential Benefits
Unsurpassed oxidation stability3 Superior performance in extreme conditions and extended ODI service.
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 CK-4 and CJ-4 requirements Long emissions aftertreatment life (DPF, DOC and SCR)

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

2Compared to an SAE 15W-40 conventional engine oil. Savings are dependent on vehicle engine type, outside temperature, driving conditions, and your current engine oil viscosity.

3Based on performance in the Volvo T-13 engine test


  • Recommended for the latest heavy duty diesel engines operating in extreme conditions, including those equipped with aftertreatment systems and EGR.
  • Recommended for diesel applications using older and naturally aspirated conventional designs.
  • On-highway heavy-duty trucking and off-highway applications including trucking, mining, construction, agriculture and marine.
  • On-highway applications operating in both high speed/high load and short haul pick-up/delivery service.
  • Off-highway applications operating in severe low speed/heavy load conditions using up to 500 ppm sulfur fuels.
  • Diesel-powered equipment from American, European and Japanese OEMs.


Mobil Delvac Extreme meets or exceeds the requirements of: 15W-40 10W-30
API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4 X X
Caterpillar ECF-3 X X
Cummins CES 20086, 20081 X X

Mobil Delvac Extreme is approved by the following OEMs: 15W-40 10W-30
Allison TES 439 X
Detroit Fluids Specification 93K222, 93K218 X X
Deutz DQC II-10 LA X X
Deutz DQC III-10 LA X
Mack EOS-4.5, EO-O Premium Plus X X
MB-Approval 228.31 X X
Renault Trucks RLD-4, RLD-3 X X
MAN M 3575 X X
Volvo VDS-4.5, VDS-4 X X

Typical Properties

Mobil Delvac Extreme
SAE Grade 15W-40 10W-30
Viscosity, ASTM D 445
cSt @ 40ºC 107.4 81.1
cSt @ 100ºC 14.3 11.8
Viscosity Index, ASTM D 2270 140 140
Density @ 15ºC kg/L, ASTM D 4052 0.872 0.867
Pour Point, ºC, ASTM D 97 -33 -42
Flash Point, ºC, ASTM D 92 221 219
Sulfated Ash, wt%, ASTM D 874 1 1
Total Base Number, mg KOH/g, ASTM D 2896 10.3 10.3
CCS, cP, ASTM D 5293 6100 @ -20C 6600 @ -25C
MRV, cP, ASTM D 4684 16900 @ -25C 18400 @ -30C
HTHS @ 150ºC, cP, ASTM D4683 4.1 3.6


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Why did you choose this?
The Lubricant Store Store
Perfect match for my 2018 Titan XD, Cummins.
John T on Aug 19, 2019
Perfect match for my 2018 Titan XD, Cummins.
John T on Aug 19, 2019
Have a Nissan Titan XD with a Cummins 5.0L diesel. So far the oil helps with heavy towing, my lead foot, and regens. Wouldn't use anything else.
K E on Sep 29, 2018
Have a Nissan Titan XD with a Cummins 5.0L diesel. So far the oil helps with heavy towing, my lead foot, and regens. Wouldn't use anything else.
K E on Sep 29, 2018
Can you use this in a gas motor?
Tbone on Nov 28, 2017
BEST ANSWER: If you are asking for an older car or an older farm tractor it would be fine to use this, however, Mobil Tech support does not recommend that you put this into a newer vehicle especially since it may void the OEM warranty.
How many miles between interval changes using Delvac synthetic oil?
Gerald D on Sep 14, 2017
BEST ANSWER: Mobil recommends looking at the OEM manual for how many miles you should change your oil. They don't like giving recommendations on how many miles because it would depend on the size engine, fuel consumption, how hard you're working the engine, etc.