Definition
The temperature of the engine's lubricating oil, displayed on a cockpit gauge and monitored to confirm the engine is warmed up enough for takeoff and is operating within its approved temperature range during flight.
Plain English
How hot the engine's oil is. The pilot watches this gauge to make sure the oil is warm enough before takeoff and not running too hot in flight.
Context Anchor
Seen during the before-takeoff check when the pilot checks the engine instruments before applying takeoff power.
Why Pilots Care
Confirms the engine has reached proper operating temperature and that the oil can both lubricate and carry away heat.
Intuition Check
Oil temperature does not mean the outside air temperature or the general warmth of the engine. It means the specific temperature of the engine oil as shown by the airplane’s oil temperature indication.
Example Sentence 1
During the before-takeoff check, the pilot confirmed oil temperature and oil pressure were both in the green arc before advancing the throttle.
Example Sentence 2
A rapid climb in oil temperature after takeoff can indicate insufficient airflow through the oil cooler.