29: Mazda 6
Mazda has cultivated a good reputation for quality cars in the last decade. But that doesn’t mean the repairs won’t be expensive when it is time. The Mazda 6 is well known for being a fun-to-drive and attractive sedan, but that fun is only skin deep (via Autolist).
The main problems for the Mazda 6 revolve around the transmission and cooling system. When these cars overheat, they overheat badly, and the cost to do the repairs is more than what most drivers might be comfortable spending. This unique issue forced the 6 to be rough on drivers’ budgets overall.