aircraft systemsFAA-published question bank (Private Pilot, 2008)
An abnormally high engine oil temperature indication may be caused by
A
the oil level being too low.✓ Correct Answer
B
operating with a too high viscosity oil.
C
operating with an excessively rich mixture.
Explanation
Oil removes heat from the engine; with too little oil there is less to carry the heat away, so PHAK notes that a low oil level can cause an abnormally high oil temperature. A rich mixture tends to cool the engine, and a high-viscosity oil is not the typical cause of high temperature readings.
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