Beautiful 2018 BMW 420i Convertible - Low Mileage, Family Owned Reluctant sale of our much-loved BMW 420i M Sport Convertible, bought brand new and owned within the same family (passed from son to mother). Genuine very low mileage at just 29,000 miles. Automatic, hard-top convertible in excellent condition and drives perfectly. Only selling as I now need a smaller car - will be sad to see it go.