How often should the spark plugs be replaced on a BMW 3 Series B48?
2 Answers
For the BMW 3 Series B58 engine, the spark plugs are typically replaced every 30,000 kilometers. Spark plug replacement interval: Under normal maintenance conditions, spark plugs should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type. It is recommended to follow the instructions in the owner's manual. You can refer to the following standards for maintenance replacement: platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Spark plug replacement steps: Open the engine hood and lift the plastic cover of the engine. Remove the high-voltage ignition wires, marking 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 everything is cleaned thoroughly. 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 high-voltage ignition wires in the correct firing order and secure the cover back in place.
I've been driving a BMW 3 Series with B48 engine for three years with frequent usage. The spark plug replacement interval depends on driving habits. The manual recommends changing them every 30,000 to 40,000 kilometers, which I find quite reliable, especially in stop-and-go city traffic where spark plugs wear faster. Personally, I replace them every 35,000 kilometers. Once I delayed it by a few thousand kilometers, and the car started experiencing slight vibrations and increased fuel consumption. A shop inspection revealed uneven ignition due to aged spark plugs. I suggest not delaying too long and having technicians check the electrode gap during routine maintenance for peace of mind and safety. Fuel quality also matters – using higher-octane gasoline can slightly extend their lifespan. After all, with such a powerful engine, timely replacement ensures smooth performance.
