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Ready for API CK-4, API FA-4?
Learn how the American Petroleum Institute’s new diesel engine oil specification change affects you, your trucks and your business. 
The development of API CK-4, API FA-4
Get more of the story behind API CK-4, API FA-4. Plus, learn how the new CK-4 and FA-4 oils can help your business. 
There are a lot of questions surrounding the new diesel engine oil specification change. Get more of the details behind API CK-4, API FA-4 here. 

API CK-4, API FA-4 products: Mobil Delvac™ diesel engine oils

Mobil Delvac diesel engine oils help on- and off-highway fleets, fleet managers and owner-operators reach their business goals. Helping to increase oil drain intervals and boost uptime, these API CK-4, API FA-4 oils are designed to outperform current CJ-4 oils. Learn more about Mobil Delvac heavy-duty diesel engine oils below. If you can’t find what you need here, please reach out to authorized distributors for more API CK-4, API FA-4 information.


API CK-4, API FA-4 Mobil Delvac™ engine oils were compared to CJ-4
Mobil Delvac™ 1300 Super and Mobil Delvac™ Elite engine oils. The test results showed that the API CK-4, API FA-4 oils provided 20 percent improved wear protection,* 50 percent improved oxidation resistance† and 80 percent improved viscosity control.† In addition, the API CK-4, API FA-4 oils showed enhanced fuel economy potential (for FA-4 products only) and protection beyond original equipment manufacturer (OEM) oil drain intervals (ODI).

*Based on a comparison of Cummins ISM and Mack T-12 engine test results.
†Based on a comparison of Volvo T-13 engine test results.


Mobil Delvac heavy-duty diesel engine oils


Mobil Delvac 1™

Mobil Delvac 1 is an advanced synthetic diesel engine oil that provides extended drain capability and exceptional low-temperature performance with the potential to improve fuel economy.‡ It meets or exceeds the requirements of OEMs, and its state-of-the-art technology provides:

  • Outstanding performance at extreme temperatures
  • Our best cold-weather protection
  • Our best protection for drivers with extended oil drain intervals
  • Enhanced emissions systems protection in a variety of severe conditions


Mobil Delvac™ Extreme

Mobil Delvac Extreme 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. Its boosted formulation provides:

  • Updated high-temperature performance/oxidation stability
  • Superior engine protection
  • Excellent anti-wear performance
  • Excellent soot and viscosity control


Mobil Delvac™ 1300 Super

Mobil Delvac 1300 Super is an advanced diesel engine oil that meets or exceeds OEM requirements and delivers high performance in both on- and off-highway applications. Its carefully tailored formulation provides:

  • Performance for up to 50 percent beyond OEM recommended ODIs§
  • Outstanding high-temperature performance
  • Superior oxidation stability
  • Excellent soot and viscosity control

*Based on a comparison of Cummins ISM and Mack T-12 engine test results.
†Based on a comparison of Volvo T-13 engine test results.
‡Compared to a 15W-40 conventional engine oil. Actual savings are dependent upon vehicle/engine type, outside temperature, driving conditions and your current engine oil viscosity.
§Results may vary based on vehicle/engine condition, driving and environmental conditions. Consult OEM or Imperial before implementing extended ODIs.