How do you preserve an engine oil system?

• A. MAINTAIN CLEAN AND FULL.
• B. CHANGE OIL DAILY.
• C. USE ONLY SYNTHETIC OIL.
• D. DISCARD OIL AFTER FLIGHT.

Answer: (A)

Preserving an engine oil system means keeping the oil clean and at the proper level so it can continuously provide lubrication, cooling, and contaminant removal. When oil is clean and the level is correct, the film strength remains sufficient to protect bearings and gears, the filters can trap debris effectively, and pressure and scavenging flow stay within design limits. Dirty oil or low oil volume allows wear, overheating, sludge formation, and potential loss of oil pressure, all of which degrade the system’s ability to protect the engine.

So the best practice is to monitor and maintain oil cleanliness and level, and follow the manufacturer’s schedule for oil and filter changes. Daily oil changes aren’t required or practical, and using only synthetic oil or discarding oil after a flight aren’t part of preserving the system; the emphasis is on keeping the oil clean and full and changing it at the specified intervals.