What could cause cylinder head temperature and engine oil temperature gauges to exceed normal operating ranges?

Using fuel with a lower than specified fuel rating can lead to increased cylinder head temperature and engine oil temperature because it can cause pre-ignition or detonation in the engine. When lower octane fuel is used than what the engine is designed for, it may ignite prematurely due to compression, leading to abnormal combustion conditions. This can create additional heat, raising both the cylinder head temperature and the oil temperature as the engine works harder to maintain performance under these stressful conditions.

High altitude operations, while they can affect engine performance and temperatures due to reduced air density, generally do not inherently cause excessive temperatures. Similarly, performing maneuvers at low speeds can have varying effects but typically does not directly lead to temperature overruns in normal circumstances. Using high octane fuel is beneficial as it prevents pre-ignition and allows the engine to run cooler and more efficiently without causing undue stress. Therefore, the choice of using lower than specified fuel is critical to maintaining normal operating temperatures in the engine.