With the exception of grade 10W oil which is not to be used in high-output, two-cycle compression-ignition engines, the lubricating oils covered by this specification are intended for preservative, break-in and operational use until the first scheduled oil change in all spark-ignition and compression-ignition engines used in all types of military tactical/combat group equipment. The oils are also intended for the same application in power transmissions, hydraulic systems and non hypoid gear units of engineer/construction equipment, materials handling equipment and tactical/combat equipment. The lubricating oils covered by this specification meet service classifications CD and SE of SAE J183 and are intended for all conditions of operational service, as defined by appropriate lubrication orders, when temperatures are above −25 °C. Recommended ambient temperature ranges for specific grade oils are shown by table V.