I have a 2015 M4 and it's about 30 days out of warranty coverage. The car has never been to the dealership for warranty issues prior, but the car suddenly developed a dead battery issues and the valvetronic system is grinding under the hood. The car has fewer than 10,000 miles on it and the dealership offered an either/or replacement, but both of these components are incredibly expensive. On such a low mileage car, it doesn't seem reasonable that these things would go bad.