Every Certified BMW Pre-Owned comes with a protection plan that is designed to provide drivers peace of mind. Otherwise known as the BMW Certified Pre-Owned Limited Warranty, this plan provides comprehensive coverage for one year with unlimited miles. New Vehicle Limited Warranty.¹ That means your Certified BMW is covered for a total of five years or unlimited vehicle miles, along with five years of BMW Roadside Assistance. For more on the Certified Pre-Owned BMW Warranty, visit our used BMW dealer in Medford, MA, today.