What should be done if oil is present in the radiator?

If oil is present in the radiator, notifying a mechanic is essential because this situation often indicates a more serious problem, such as a blown head gasket, which can lead to engine damage if not addressed properly. A mechanic has the expertise to diagnose the issue accurately, determine the source of the oil contamination, and recommend the appropriate repairs or solutions, ensuring the integrity of the vehicle's engine and cooling system. Taking this step helps prevent further complications and ensures that the vehicle remains safe and operational.

In this context, while checking the oil level is a routine maintenance step and flushing the radiator may seem like an immediate solution, these actions do not address the root cause of the problem. Replacing the radiator might be necessary if it has been damaged but is not the first step; diagnosing the source of the oil contamination is crucial before taking any further actions.