Like all of the BMW 8 Series Convertible’s rivals, it’s an expensive car to buy and run. Nonetheless, few competitors are available with a diesel engine so that will certainly keep costs down for those that cover larger mileages, though not everyone will like the idea of running one as a convertible. Still, at least there’s the choice. On top of that, the resale values are expected to be strong for this car, reducing the cost of depreciation. However, that’s offset by expensive consumables, tax and insurance. In fairness, all cars in this elevated bracket are in the same boat, and buyers that can afford this car will be prepared for the running costs. Fixed-price servicing is offered by BMW too.