MIL-PRF-21260E

Abstract

This performance specification covers engine oils suitable for preservation, break-in, and lubrication of reciprocating internal combustion engines of both spark-ignition and compression-ignition types, and of power transmission fluid applications in equipment used in combat/tactical service (see <a>6.1</a>, <a>6.7</a> and <a>6.9</a>). <b><u>Intended Use:</u></b> The SAE 1OW grade oil is not to be used in high-output, two-cycle compression-ignition engines. The lubricating oils, except as mentioned above, covered by this specification are intended for the preservative, break-in and operational use until the first scheduled oil change of all spark-ignition and compression-ignition engines used in all types of military combat/tactical ground equipment and for the crankcase lubrication of two-cycle, four-cycle, high-speed, high-output, supercharged compression-ignition engines used in all ground equipment. The oils are also intended for the same application in power transmissions, g hydraulic systems, and non-hypoid gear units of engineer/construction equipment, materials handling equipment and combat/tactical ground equipment. The lubricating oils covered by this specification meet service classifications API CG-4, CF of SAE J183 and are intended for all conditions of operational service, as defined by appropriate lubrication orders, when temperatures are above &#8722;25&#176;C (see <a>6.7</a>). This specification requires an oil formulation that is both versatile-used as engine oil, transmission fluid, and hydraulic fluid-and meets extreme operating environmental conditions for use in combat/tactical ground equipment. These requirements cannot be found in current industry standards and are not appropriate for other Government vehicles. <br>