Is It Necessary to Replace the Spark Plugs After Driving 20,000 Kilometers in a BMW 7 Series?
2 Answers
It is necessary to replace the spark plugs after driving 20,000 kilometers in a BMW 7 Series. Spark plugs are installed on the side or top of the engine. In earlier models, spark plugs were connected to the distributor via ignition cables. However, over the past decade, most car engines have been modified to connect the ignition coil directly to the spark plug. Steps to replace the spark plugs: Open the hood, lift the plastic cover of the engine, and remove the high-voltage ignition wires. Mark the position of each cylinder to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris such as leaves or dust and ensure they are thoroughly cleaned. Place the new spark plugs into the spark plug holes, hand-tighten them a few turns, and then use the socket to tighten them further. Reinstall the removed high-voltage ignition wires according to the firing order, and then secure the cover.
As a professional who has been repairing BMWs for years, I've encountered many BMW 7 Series owners asking this question. To be honest, replacing spark plugs after 20,000 kilometers is quite necessary. BMW engines are typically designed for high RPMs, and spark plugs are prone to carbon buildup or wear under high temperatures, which affects ignition efficiency. If not replaced, it may lead to engine shaking, reduced power, or even ignition failure, and in severe cases, damage to the catalytic converter. The BMW official manual generally recommends replacing spark plugs every 20,000 to 30,000 kilometers, especially for high-end models like the 7 Series. Driving habits can also accelerate wear, such as frequent hard acceleration. My advice is not to wait until problems arise—early replacement ensures smooth engine operation and avoids higher repair costs.
