When must the oil pressure be serviced after engine shutdown?

The correct answer indicates that oil pressure must be serviced within 30 minutes of engine shutdown to ensure accurate readings and maintain engine health. This timeframe allows for accessibility to the oil pressure readings while still within a reasonable condition of temperature, as oil can settle and temperatures can balance out shortly after the engine stops running.

Servicing the oil pressure too soon, such as immediately after shutdown, may provide readings that do not reflect the true state of the engine's oil pressure. It is important to wait a short duration to obtain the most reliable gauges, ensuring the engine internals are properly assessed and serviced if necessary.

By suggesting a timeframe of within 30 minutes, it allows for better calibration of service checks that can be performed when conditions are more stable compared to any immediate readings right after shutdown, which may not give the full picture needed for effective maintenance.