About Us Welcome to Derwydd Garage Ltd we are Used Car Dealership in Carmarthen with over 40 years expertise and within the Industry. Our staff are on hand to answer any questions you may have from start to finish. At Derwydd Garage we provide a one-stop solution for your motoring needs all under one roof. Whether it is a service for your car, if you need some petrol, need an MOT, or you're looking to buy a used car we can help. At Derwydd Garage, we make a point of only selling top quality used cars with a key focus on low mileage and quality vehicles. No matter which car you purchase, you can be sure you are buying a great car. We offer full MOT and Service facilities on-site, within our workshop and also have a Murco petrol station and shop to cater for all your needs whilst out on the road. If you can't find the car you want on site, just ask us. What makes us different is that you can also find extra items you wouldn't find at most other petrol stations such as coal, anthracite, logs, charcoal, potatoes, bottled gas and even pet food!