At how many kilometers should the spark plugs be replaced for a BMW 5 Series?
2 Answers
The replacement cycle for spark plugs in a BMW 5 Series is 40,000 kilometers. If the spark plugs are not replaced for a long time, it can lead to various issues such as leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and most importantly, difficulty in ignition, which affects the normal use of the vehicle. Spark plug replacement cycle: Under normal maintenance conditions, replacement is recommended between 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine, so it is advisable to follow the user manual. The following standards can be referenced 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, lift the plastic cover of the engine, and remove the high-voltage distributor 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 like 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 removed high-voltage distributor wires according to the ignition sequence and secure the cover.
I remember replacing the spark plugs on my BMW 5 Series at around 40,000 kilometers. At that time, I felt the acceleration was a bit sluggish on the highway, and the fuel consumption was slightly higher than usual. The mechanic found significantly enlarged electrode gaps and cracks on the ceramic body after disassembly. He specifically warned that turbocharged engines have higher ignition requirements, and aged spark plugs could lead to insufficient ignition energy. In severe cases, unburned fuel mixture might enter the catalytic converter and cause damage. For daily driving, urban drivers with frequent traffic congestion might consider inspection at around 30,000 kilometers, while those who often drive on highways can delay it appropriately. It's best to have the mechanic check the spark plug condition during each maintenance service—this is definitely not an area to cut corners.
