The U.S specification SAE J-1899 replaces MIL-L-22851D;
Although it was planned to replace the British Specification DERD 2450 with a DEF STAN Specification this has now been put into abeyance and instead the SAE specification has been adopted;
U.S. Approved J-1899 SAE Grade 50;
British Approved J-1899 SAE Grade 50;
French AIR 3570 (Grade SAE 50, indicates the product is equivalent to specification);
Russian MS-20;
NATO Code O-125 Obsolete;
Joint Service Designation OMD-250;
Textron Lycoming 301F;
Teledyne Continental MHS 24B;
Pratt & Whitney Service Bulletin 1183-S;
Curtiss Wright, Various Service Bulletins -refer to relevant Bulletin;
Franklin Engines, Various Service Bulletins – refer to relevant Bulletin
