1. Mercedes-Benz W123
The Mercedes-Benz W123 is a textbook case of overengineering.
Built between 1976 and 1985, it quickly earned a reputation for unmatched durability.
Taxis across Europe and Africa still use these cars, some boasting over a million miles on original engines.
Its legendary longevity meant owners rarely needed a replacement, leading Mercedes to reconsider its approach in future models.
The W123’s bulletproof build became both its legacy and its business challenge.