Ron Doyle Motors - Service and Spare Parts Servicing your Holden, Nissan or Mazda is the most important thing you can do to keep it in tip top condition. At Ron Doyle Motors our service section has all the equipment and highly trained technicians to keep your car at its very best. As with all franchise dealers we have the latest computer diagnostic equipment to tell us exactly what going on with your car and by using this diagnostic equipment we can find the fault and fix it quickly and efficiently to help keep your costs down.