What are the reasons for replacing spark plugs in the Mercedes Vito?

[BrooklynDella]

Mercedes Vito spark plug replacement steps are as follows: Open the engine hood, lift the plastic engine cover, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing, check for external debris like leaves or dust and ensure thorough cleaning. Place the new spark plug into the spark plug hole, hand-tighten it for a few turns, then use the socket to tighten further. Reinstall the removed high-voltage distributor wires according to the firing order, then snap the cover back into place. Spark plug replacement interval: Under normal maintenance conditions, replace every 40,000-60,000 km. However, this may vary depending on brand and engine type. Always refer to the owner's manual. Maintenance replacement can be based on these standards: Platinum spark plugs at 40,000 km, standard nickel alloy spark plugs at 20,000 km, and iridium spark plugs at 60,000-80,000 km.