How and when do replace the spark plugs on a infinity g35 2007?

To replace the spark plugs on a 2007 Infiniti G35, first ensure the engine is cool, then disconnect the battery. Remove the engine cover and the ignition coils to access the spark plugs. Use a spark plug socket to carefully unscrew the old plugs and replace them with new ones, ensuring they are gapped correctly. Reassemble the components, reconnect the battery, and start the engine to verify proper installation. It's generally recommended to replace spark plugs every 60,000 miles, but always check the owner's manual for specific guidance.