is the time between oil drains from a sump or
crankcase. Oil drain intervals may vary widely depending on
the type of oil and the application. Some premium-quality
turbine oils can remain in service for
decades without an oil change, whereas an automotive
engine oil may require changing after
several months of engine operation. Following recommended oil drain
intervals is essential to maintaining an oil’s ability to lubricate and
prevent deposit buildup on critical parts.
Also see engine deposits.