The lubricating oils covered by this specification are intended for the crankcase lubrication of reciprocating compression-ignition engines, powershift transmissions, hydraulic systems, and non-hypoid gear units of engineer/construction equipment, materials handling equipment and all types of combat/tactical ground equipment. Although this specification has been developed to meet a wide range of lubricating functions, it is brought to the attention of military Program Managers (PM) and their associated contracting personnel the requirement to ensure that equipment, whether military unique or commercially-off-the-shelf (COTS), are compatible with military standard lubricants (see AR 70-12 and MIL-HDBK-838 for additional guidance). Lubricating oils covered by this specification meet service classifications API CI-4 and include a modified DDC 6V92TA 2-cycle diesel engine test and selected transmission requirements. Oils meeting this specification have not been required to be tested in accordance with the complete Caterpillar TO-4/TO-4M or Allison C-4 requirements. Therefore, without further testing and verification, these oils cannot legitimately be marketed as meeting either the Caterpillar TO-4/TO-4M or Allison C-4 requirements. The combination of engine and powershift transmission requirements in this specification are not required of typical commercial heavy-duty diesel engine oils. These oils are intended for all conditions of operational service, as defined by appropriate lubrication orders. Recommended ambient temperature ranges for specific grade oils are shown in table XVII.