MIL-PRF-46167C, PERFORMANCE SPECIFICATION, LUBRICATING OIL, INTERNAL COMBUSTION ENGINE, ARCTIC (31 JUL 1998) [SUPERSEDING MIL-L-46167B]., This performance specification covers one grade of internal combustion engine lubricating oil with military symbol OEA-30 and NATO Code O-184, suitable for arctic use (see 6.1, 6.7 and 6.10).