To use these K - Tuned oil cooler plugs, first make sure the engine is cool and turned off. Locate the unused oil cooler ports on the water pump and the block. Then, carefully insert the plugs into the ports. It's important to ensure a tight fit. As for maintenance, regularly check the plugs for any signs of wear or damage. If you notice any issues, replace the plugs right away. When handling the plugs, be gentle to avoid any scratches or dents that could affect their performance.