How often should fluid levels such as engine oil and coolant be checked?

Fluid levels, including engine oil and coolant, should be checked regularly as part of the pre-trip inspection. This practice is crucial for maintaining vehicle safety and performance. Regular checks help identify any leaks or fluid losses that could lead to engine overheating or mechanical failure during operation.

Incorporating these checks during every pre-trip inspection ensures that the vehicle is in optimal condition for driving, minimizing the risk of breakdowns and ensuring compliance with safety regulations. Monitoring fluid levels frequently allows for proactive maintenance, which can save time and money by addressing potential issues before they lead to more significant problems.

Other options suggest less frequent checks, which do not align with best practices for vehicle maintenance. Checking fluid levels only once a month, during oil changes, or when the vehicle is not in use could allow small issues to escalate, potentially compromising safety on the road.