MIL-PRF-21260E

MIL-PRF-21260E, PERFORMANCE SPECIFICATION: LUBRICATING OIL, INTERNAL COMBUSTION ENGINE, PRESERVATIVE BREAK-IN (31-JUL-1998) [SUPERSEDING MIL-L-21260D]. 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 6.1, 6.7 and 6.9).