Aircraft systems and instrumentsQuestion 629 of 934

Which condition can cause a high oil temperature indication?

  1. A very rich mixture at high power
  2. Too much oil in the oil tank
  3. A low oil quantity or a blocked oil cooler
  4. Oil with the wrong viscosity for cold weather
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Correct answer: A low oil quantity or a blocked oil cooler

High oil temperature can also signal a plugged oil line or a defective gauge. Low oil temperature can signal improper oil viscosity in cold weather.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Oil Systems, page 177

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026