Manual transmission fluid is one of the most overlooked maintenance items and is usually one of the simpler, more economical services. It usually consists of draining the fluid, flushing & refilling. Inspecting for abnormal debris from internal failure, and/or moisture due to condensation are important steps. The cost of the service will fluctuate depending on recommended fluid type. However most manual transmissions usually hold no more than 4 quarts. With advances in technology comes the need for special lubricants to keep that technology working properly, so maintaining that fluid is vital to the life and performance of manual transmissions.
According to the Automatic Transmission Rebuilders Association, 90% of ALL transmission failures are caused by overheating. Most of these can be blamed on worn out fluid that should have been replaced. For optimum protection, change the fluid and filter every 30,000 miles. What kind of automatic transmission fluid should you use in your transmission? The type specified in your owner's manual or printed on the transmission dipstick. For older Ford automatics and certain imports, Type "F" is usually required. Most Fords since the 1980s require "Mercon" fluid, which is Ford's equivalent of Dexron II. For General Motors, Chrysler and other imports, Dexron II is usually specified.