Which practices can significantly improve aircraft engine performance?

Regular maintenance, using the correct fuel type, and monitoring operating temperatures are essential practices that significantly enhance aircraft engine performance.

Engines require consistent maintenance to ensure all components function efficiently and to prevent issues that can lead to performance degradation. Regular inspections, oil changes, and timely replacements of worn parts are crucial in maintaining optimal engine functionality.

Using the correct fuel type is vital, as different engines are designed to operate with specific fuel specifications, which include the right octane rating and additives that influence performance and efficiency. Using the wrong fuel can lead to engine inefficiencies, increased wear, or even engine failure.

Monitoring operating temperatures helps to ensure that the engine is functioning within its designed parameters. Operating outside of recommended temperature ranges can lead to overheating, which can cause permanent damage to engine components and negatively affect performance.

In contrast, infrequent maintenance and low-quality fuel, as described in the other choices, can lead to significant issues, while flying with old engines or neglecting operating guidelines compromises overall aircraft safety and efficiency. Thus, the practices outlined in the chosen option directly contribute to sustained and improved performance of aircraft engines.