I had a bit of a clean up of the car this weekend, cleaned the engine bay, washed, waxed etc, and put some injector cleaner in there before tearing up the M4 to run it all through.
However, looking at the posts in this forum, some people have mentioned Panel Filters and that they get dirty and that they need cleaning or replacing.
Do BMW change these as part of a service (which its due for in the next few weeks) or is this something I should be doing?
Also, where is the panel filter? I'm no mechanic but I'm guessing that this is something to do with the air filtration unit?