The recommended replacement automatic transmission fluid is genuine Honda ATF DW-1. If necessary, you can also use any other Dexron III ATF. The tools needed to complete this procedure include a 17mm socket, an extension bar, a 3/8" drive ratchet, a used oil catch basin, a long ATF funnel and at least 4 U.S. quarts of ATF. TRANSMISSION FLUSH AND FLUID CHANGE. By keeping up with the your vehicle's recommended transmission fluid change schedule, you can keep your transmission in good working order and decrease the likelihood of costly transmission repairs down the road. In many cases, a transmission fluid exchange is due every 30,000 miles or 2 years.