When should the automatic low-level oil indicator switch be tested?

The automatic low-level oil indicator switch should be tested every three months to ensure proper functionality. This regular testing frequency is essential because the low-level oil indicator is a critical safety feature that alerts the operator when the oil level drops below a predetermined threshold. By conducting tests every three months, it allows for timely detection of any potential issues with the switch that could otherwise lead to equipment failure or unsafe operating conditions. Regular testing helps maintain safety standards and operational readiness, which is crucial in emergency response settings like those handled by the fire department.