It’s been 15 years and 80800 miles since I’ve done anything to my old faithful 2008 Q7. I’d bought 6 spark plugs NGK Laser Iridium 4 years ago and haven’t needed to replace them since the car starts right up cold or hot, idles perfectly and acceleration briskly. But since I’ve time and bought the tools to remove the ignition coil, I decided to replace them. It’s not hard, it’s just tedious, lot of reaching because the car is so high, I needed a chair to do it. The important thing is the ignition coil puller, without it, it will be extremely difficult and I might break something with the ignition coil in the process. It’s quite straight forward as all my spark plugs replacement.