How often should the spark plugs be replaced on a BMW 5 Series?
2 Answers
BMW 5 Series spark plugs should be replaced every 40,000 kilometers. If the spark plugs are not replaced for a long time, it may cause issues such as leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and most importantly, difficulty in starting, which can affect the normal use of the vehicle. Spark plug replacement cycle: Under normal maintenance conditions, spark plugs should be replaced between 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type, so it is recommended to follow the user manual. The following standards can be referred to for maintenance and replacement: platinum spark plugs should be replaced at 40,000 kilometers, standard 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, 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 cleaned thoroughly. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, and then use the socket to tighten it further. Reinstall the high-voltage ignition wires in the correct firing order and secure the cover.
We veteran BMW enthusiasts all know that spark plug replacement for the 5 Series depends on which generation of engine you've got. Take my F18 with the N20 engine - the manual says change them at 60,000 km, but in reality, you can feel increased vibration during cold starts after just 40,000 km. The newer B48 engine is more durable, with official recommendations at 80,000 km. But don't take that number as gospel! If you're stuck in city traffic with short commutes every day, changing them at 60,000 km is the way to go. Last time I got OEM parts replaced at the dealership with labor, it cost over 2,000 RMB. You can save a third by using high-end NGK or Bosch plugs at a reputable independent shop. Remember - if you wait until the engine throws a fault code, you're already damaging the catalytic converter!
