At my last job, the owner had a 2001 Audi S6. After doing the timing belt a few times(due to component failures not related to the belt), timing chain tensioners, and the little plastic coolant pipe they hide under the motor mount bracket on the passenger side(wtf?)...I can say it’s, by far, the most difficult car…

I used to work at an independent Land Rover repair shop...just wait until the electric steering column lock decides not to unlock one day...good times. Even if it fails in the unlocked position, it still disables the ability to start the car because the lock is in an “unknown state”. Rover at least took that…