The maintenance of hardtop convertible is very expensive, but there is no data on the frequency of use (switching times) when it leaves the factory. The car dealer only insured the factory. I wonder what policy your car dealer gave me. I bought a German original 328 i hardtop, but the dealer gave me the problem that the engine appeared within 654.38 million miles, so I took it back to the dealer for a free replacement. Free oil change within five years, free wear of brakes and wheel bones. If there is a problem within five years, take it back to the original factory for free inspection. If the parts are worn normally, you have to pay for it yourself, and if the car itself is defective, it will be replaced free of charge. In short, BMW is still very expensive to repair. Just tell the dealer when you buy a car.