Mobil™ HDEO

Heavy Duty Engine Oil

MOBIL FLEET 15W-40 has been renamed MOBIL HDEO (Heavy Duty Engine Oil) 15W-40 and has been reformulated to meet the new CK-4 specifications.

Mobil HDEO 15W-40 and 10W-30 are oils designed to meet warranty requirements for high-speed, fourstroke heavy duty diesel engines. These products are formulated to maintain the durability of emission control systems, including diesel particulate filters and other advanced aftertreatment systems. These products are also approved by major original equipment manufacturers (OEM).

Mobil HDEO meets or exceeds the requirements of: API CK-4, CJ-4, CI-4 PLUS, CI-4, CH-4, Caterpillar ECF-3, Cummins CES 20086, 20081

Recommended by ExxonMobil for use in:

  • Heavy duty diesel applications including low emission engine designs and those featuring EGR. 
  • Heavy duty diesel applications using older and naturally aspirated conventional designs.



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