Convertible roofs on Mercedes cars are known for terrifying repair bills. When this one failed, the car instantly became almost worthless. Dealer quotes would have exceeded what I paid for the car.

The 2021 BMW 4 Series Convertible is arriving with a new fabric roof. Replacing the cumbersome folding hardtop of the outgoing 4 Series Convertible, the new soft-top roof is 40-percent lighter and ...