BMW Spark Plugs

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Both M54 and N52 engines use a coil-over-sparkplug setup, with one ignition coil above each spark plug. The spark plugs should be replaced every 100,000 miles. The spark plug electrode gap is not adjustable. To replace, remove the engine cover, unlock the ignition coil connector, and pull it off the coil. Remove the ignition coil from the spark plug hole. Cleanliness is crucial to avoid electrical resistance issues. Use a thin-walled spark plug socket to remove the spark plugs. If not available for the N52, remove the ignition coil sleeves before removing the plugs. Inspect the spark plug electrodes; light grey indicates normal combustion. When installing new plugs, lubricate the threads with a copper-based compound. Thread the plugs by hand to avoid cross threading. If the ignition coil sleeves were removed, replace them. Finally, insert the ignition coils into the spark plug wells and reattach the connectors.