My dad had a Mercedes in the 1960s. It was not a very reliable car. He later bought a Chevy which was much more reliable.

I bought a 1963 230SL Mercedes as a young man. It was such a beauty! But it was a terrible car. As an engineer, I could see that it was a patchwork of brilliant design and stupid design. The latter caused lots of problems. Sadly, I gave up on it. Stupidly, I bought a Mercedes wagon some years later, and it, too, suffered from the patchwork of stupidity. Got rid of it.

My 1967 Mustang was much better engineered. Ford gets a lot of guff, but their cars are inexpensive and easy to repair, which I appreciated. It had a sad end being crushed on the highway by a truck. I had a 1989 Bronco II and drove it for 20 years.

A friend of mine is restoring an old Mercedes, and he (also an engineer) discovered the Mercedes patchwork of stupidity. One of the problems is the radiator is undersized, making the car prone to overheating. He's engineering a fix for that.