My dad bought a Kadett when we became a two-car family in the 60’s (Mom got the Rambler Rebel, and then a 72 Impala). It lasted until ’77, when we used the Impala to help push it down the highway and into the Olds dealership where they were having a “We’ll give you $1000 for whatever you can drive onto the lot” trade in sale. (Sadly, we got an awful 77 Cutlas Supreme). I got some of my early driving lessons (in the neighborhood) in that Opel – shifting gears from the passenger seat, or sometimes riding on my Dads lap and steering.
It had some crazy mechanical issues. At one point it stumbled and stalled because the carburetor had come loose from the intake manifold and I had to tighten it back down! Another time, my brother was driving it and the brakes failed. Somehow the end of the brake shoe that meets the brake cylinder piston had become worn on one side, causing the piston to slip off the end of the shoe when the brakes were applied, losing braking and squirting fluid all over.