FAA Ground School Practice Test

What could cause an abnormally high engine oil temperature indication?

1. The oil level being too low

2. High engine RPMs

3. High altitude flying

4. Using a non-recommended oil type

The correct answer is: The oil level being too low

An abnormally high engine oil temperature indication can indeed be attributed to the oil level being too low. When the engine oil level is insufficient, it can result in inadequate lubrication and cooling of the engine components. Oil serves not only as a lubricant but also as a means to transfer heat away from critical engine parts. If there isn’t enough oil circulating, the remaining oil can become overheated due to increased friction and lack of effective cooling. This can lead to increased engine temperatures and potentially significant engine damage. While high engine RPMs can contribute to an increase in engine temperature due to greater activity and heat generation, it is the oil's level that has a more direct impact on overall temperature readings. High altitude flying may also affect engine performance but does not typically lead directly to high oil temperature unless compounded by other factors like reduced air density affecting cooling. Similarly, using a non-recommended oil type can impact engine performance, but the most immediate cause of a high oil temperature reading stems from having an insufficient oil level, making proper maintenance and routine checks critically important for aircraft safety.