The aircraft oil change is more than draining the sump then refilling it. Just like in a car, the oil filter which is a one-time use device made up of accordion-style folded paper.

The aircraft oil change is more than draining the sump then refilling it. Just like in a car, the oil filter which is a one-time use device made up of accordion-style folded paper.

Small aircraft should have oil changes every four months or after 50 hours of operation, whichever comes first. For the average user, this represents about three oil changes per year.