It is recommended to replace the spark plugs with new ones every 15,000 km.
Before installing new spark plugs, check the gap between the spark plug electrodes, which should be within 0.6 mm. It can only be adjusted by bending the side electrode.
The spark plugs may only be removed from the cylinder head using a special wrench.
Before installing the spark plugs, lubricate their threaded portion with a thin layer of graphite grease.
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Spark plugs (BMW 3 Series E21)
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