British : Approved J-1899 SAE Grade 50, Curtiss Wright : Various Service Bulletins – refer to relevant Bulletin, Franklin Engines : Various Service Bulletins – refer to relevant Bulletin, French : AIR 3570 (Grade SAE 50), Joint Service Designation : OMD-250, NATO Code : O-125 Obsolete, Pratt & Whitney : Service Bulletin 1183-S, Russian : MS-20, Teledyne Continental : MHS 24B, Textron Lycoming : 301F, The U.S. specification SAE J-1899 replaces MIL-L-22851D, U.S. : Approved J-1899 SAE Grade 50
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