How often should BMW spark plugs be replaced?
2 Answers
BMW spark plugs generally need to be replaced every two years or 40,000 kilometers. If spark plugs are not replaced for a long time, it may cause various issues such as leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and most importantly, difficulty in ignition, affecting the normal use of the vehicle. 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, so it is recommended to follow the user manual. The following standards can be used as a reference for maintenance and 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. Steps for replacing spark plugs: Open the hood and lift the engine's plastic 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 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 and hand-tighten them a few turns before using the socket to tighten them further. Reinstall the removed high-voltage distributor wires in the correct firing order and secure the cover.
As a young enthusiast who frequently does minor modifications for BMWs, I believe spark plug replacement is quite crucial. BMW generally recommends changing them every 60,000 to 100,000 kilometers, depending on the model and engine. For example, high-performance M series models might need earlier replacement, around 40,000 kilometers. If you often drive aggressively or take long trips, worn spark plugs can directly affect fuel efficiency and power. I once waited until 100,000 kilometers without changing them, and the engine started shaking badly—almost causing an accident. I usually refer to the owner’s manual and avoid using low-quality spark plugs; opting for iridium or platinum types can last much longer. Regular replacement not only saves 5-10% on fuel but also protects the engine control module from chain-reaction damage. In short, based on your driving habits, regular maintenance is always the right move—don’t wait until symptoms appear, because by then, it’s already too late.
