[petre]

I don't quite like the fact that the spark plug is burried deep inside the engine which makes servicing difficult. Reminds me of Porsche boxer spark plug changes for which you need to unmount the rear wheels.

[workmandan]

Looks to me from image 3 at the bottom of the page that the whole unit unthreads: http://www.mahle-powertrain.com/en/experience/mahle-jet-igni...