If oil is found in the radiator, what is the first action you should take?

Finding oil in the radiator indicates a potential issue with your vehicle, often suggesting that there is a coolant leak or that engine oil is mixing with the coolant. This is a serious situation that can lead to significant engine damage. Alerting a mechanic is the appropriate first action because they have the expertise and tools needed to diagnose and resolve the underlying problem accurately.

Running the engine in that condition could exacerbate the issue, as it may lead to overheating or further contamination. Trying to drain the oil or checking the oil level might provide temporary information, but they do not address the critical underlying problem, which requires professional evaluation, especially since it's essential to ensure that the engine operates properly and safely. Prioritizing professional assessment helps prevent further damage and maintains the vehicle's reliability.