MIL-PRF-2104H, PERFORMANCE SPECIFICATION LUBRICATING OIL, INTERNAL COMBUSTION ENGINE, COMBAT/TACTICAL SERVICE (12 JUL 2004) [SUPERSEDING MIL-L-2104F]., This performance specification covers engine oils suitable for lubrication of reciprocating compression-ignition internal combustion engines and for power transmission fluid applications in combat/tactical service equipment (see 6.1).