Final answer:
The reference does not provide a specific temperature for when oil temperature monitoring is necessary. However, it is essential to monitor oil temperatures in vehicles to prevent overheating and maintain engine efficiency.
Step-by-step explanation:
The question concerns the engine oil temperature monitoring in vehicles, specifically when oil pressures are above idle. The correct range of temperatures for which oil temperature monitoring is required isn't clearly provided in the reference information.
However, it is generally understood that automobile engines must operate within certain temperature ranges to prevent overheating. Exceeding optimal temperature ranges can reduce engine efficiency and potentially cause engine damage. Thus, it is imperative to monitor oil temperature when oil pressure is above idle to ensure the engine remains within safe operational limits.