How does regular engine maintenance contribute to engine performance?

Regular engine maintenance significantly contributes to engine performance by ensuring that all components are clean and functioning properly. When an engine is well-maintained, parts such as the air filter, fuel injectors, and spark plugs are kept in optimal condition, leading to improved combustion efficiency. Clean components allow for better airflow and fuel atomization, which enhances the overall performance of the engine. Additionally, timely maintenance prevents the buildup of dirt and grime that can impede the functioning of various engine parts, thereby contributing to smoother operation and better fuel economy.

The option about lowering engine weight is not related to maintenance practices and does not directly improve engine performance. Adding unnecessary fluids can actually harm engine performance by causing leaks or contamination rather than promoting efficiency. Finally, while regular maintenance can improve fuel efficiency, it doesn't inherently reduce the need for fuel; rather, it optimizes fuel use, making the engine run more efficiently with the fuel it consumes.