What can excessive engine oil temperatures indicate during operation?

Excessive engine oil temperatures during operation can indicate potential engine damage or failure. When oil reaches temperatures beyond the normal operating range, it can lose its lubricating properties, leading to increased friction and wear among engine components. This overheating can cause breakdown of the oil, resulting in sludge formation and the possibility of engine seizures or damage to critical parts such as bearings, pistons, and cylinder walls.

Monitoring oil temperature is crucial because it provides insight into the engine's overall health. Elevated oil temperatures may also suggest issues such as abnormal combustion, inadequate oil circulation, or problems with the oil cooler. Addressing these concerns promptly is important to prevent more severe damage to the engine.

The other options may relate to engine performance but do not directly correlate with the effects of excessive oil temperature on an engine's integrity and operation.