Jet engine oil lifetime and oil change

Oil systems for commercial jet engines are rarely drained. There is no oil change as long as the engine stays on wing. The oil is only renewed by top-up, typically accomplished every day to compensate for normal engine oil consumption.

Consequently, the oil contained in the tank is a mixture of different-aged oils, some old and some new. To minimize potential problems, the choice of lubricant must be suitable to the engine situation, particularly when high cycles and very low consumption prevail.

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