Is it necessary to apply insulating silicone when replacing spark plugs?

[StClayton]

When replacing spark plugs, it is recommended to apply insulating silicone, which has properties such as ozone resistance, high temperature resistance, and aging resistance. It also provides strong sealing capabilities, effectively preventing dust and contaminants from entering the sealed areas. Therefore, it is advisable to apply insulating silicone on the white ceramic part of the spark plug to prevent electrical tracking and leakage. Process for replacing spark plugs: Open the engine hood, lift the plastic cover of the engine, and remove the high-voltage ignition wires. Mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris like leaves or dust and ensure they are thoroughly cleaned. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the removed high-voltage ignition wires according to the firing order, and then secure the cover. Spark plug replacement interval: Under normal maintenance conditions, spark plugs should be replaced every 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is best to follow the user manual. The following standards can be referenced for maintenance replacement: platinum spark plugs should be replaced at 40,000 kilometers, standard nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.