In which situation should you check your vehicle's oil pressure?

Checking your vehicle's oil pressure is crucial when experiencing a loss of power. Oil pressure is vital for the proper lubrication of the engine components, and a drop in oil pressure can indicate that the engine is not receiving sufficient lubrication. This lack of lubrication can lead to increased friction, overheating, and ultimately engine failure. If you notice a loss of power while driving, it’s important to check the oil pressure to ensure the engine is functioning properly and to avoid further damage.

While the other scenarios may also warrant checking various vehicle systems, they are not specifically indicative of potential oil pressure issues. For instance, checking oil pressure at high RPM could stem from a different concern, such as performance tuning, but loss of power directly relates to oil pressure's ability to keep the engine lubricated and functioning efficiently.