What maintenance should be performed on a spark plug?

The most suitable maintenance for a spark plug involves inspecting it for wear and cleaning it if necessary. Spark plugs play a crucial role in the ignition process of an engine, and their condition directly impacts engine performance, fuel efficiency, and emissions. Regular inspection allows the user to identify issues such as erosion, fouling, or carbon buildup that can affect the spark plug's ability to function properly.

Cleaning a spark plug can sometimes restore its performance, especially if it is simply fouled with carbon deposits. However, if the inspection reveals that the spark plug is excessively worn or damaged, it may need to be replaced rather than just cleaned. This proactive maintenance can extend the life of the spark plug and ensure optimal engine performance.

The other options do not represent the best practice for spark plug maintenance. Regularly changing the spark plug with every oil change may not be necessary, as spark plugs can last many oil change cycles depending on their type and the engine's operating conditions. Soaking a spark plug in fuel is not recommended as it does not contribute to its maintenance and can create safety hazards. Additionally, replacing a spark plug every five years is arbitrary, as the actual lifespan can vary based on usage and engine type. Regular checks and cleaning, combined with timely replacements based