Abstract: According to the requirements of piston aeroengine and the problems such as more coke deposits and poor low temperature start-up performance,in use of the synthetic hydrocarbon aviation lubricating oil, a new type of lubricating oil – 4060 aviation lubricating oil was developed to meet the needs of the users. The developed oil had excellent sludge dispersibility, anti-corrosion and anti-oxidation stability, shear stability, excellent lubricating performance and material compatibility. All the performances met GJB 1219A—2009 specification for aircraft reciprocating engine (piston) oil. The production process of the developed oil was investigated, and the stability of batch product was good. The developed oil passed L38 bench test, 300h engine test and 600h engine test, and had successfully completed the aircraft test flight. The test proved that 4060 aviation lubricating oil has very good cold starting performance, and can extend the oil changing period to 4 times of that of before.

Key words: piston engine, aviation lubricating oil, semi-synthetic, dispersibility, cold starting performance