The United States Air Force has been using synthetic gas turbine lubricants for the past four years. Higher performance engines made previously used mineral oils unsatisfactory because of their high coking tendencies, high evaporation loss at elevated temperatures, and their lack of load‐carrying ability to lubricate turboprop engine reduction gear. In December 1951, the U.S. Air Force issued specification MIL‐L‐7108, establishing the requirements for a synthetic based lubricant. This specification was written around an Esso Standard Oil Company formulation WS‐2211, now marketed as Esso Turbo Oil 15. A paper presented to the SAE Golden Anniversary Aeronautic Meeting in New York in April, by Davidson, Cooley and Way, of the Power Plant Laboratory Wright Air Development Centre, Air Research and Development Command, U.S.A.F., has detailed the Air Force's experience with these lubricants.
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