Bring your preferred Engine oil / oil filter and visit Doctor Gearbox on a Sunday to get FREE labour charge for engine oil changing! *Except Commercial Vehicles. Doctor Gearbox is a leading auto transmission & gearbox specialist with more than 40 years of experience in the market. Their mechanics are all highly trained and updated on the latest developments in the auto transmission industry. At Doctor Gearbox, you can find services such as full/partial rebuild of the transmission, engine servicing which include major overhaul, aircon repair as well as car servicing. Equipped with a wide and in-depth knowledge, they can implement a rigorous and stringent process to solve any gearbox issues. So, rest assured that your car is in good hands.