Under the Hood: The essentials for changing transmission fluid
Assuredly question: I’m due for an automatic transmission fluid change for an ’04 Accord V6 with 126,218 miles on it. The proprietress’s manual recommends draining and filling the ATF Z1 four times, driving and active the car through all gears between each drain and fill. I’ve contacted three mechanics, including two Honda mechanics who told me they only do one cripple and fill because that’s all that is necessary. One mechanic said you only need to spend and fill four times for the first change, so as to dilute out the incorrect liquor that was put in by the factory. Another said you only need to do one drain and fill if the fluid is warmed up, rather than aloof.
Which procedure is correct, and why?
Answer: Wow, this is like asking three doctors why your elbow hurts! Breach the drain plug of your automatic transmission allows only about 40 percent (3.1 quart) of the solution to escape. The remaining fluid is trapped in the torque converter and a multitude of internal places and passages. This makes a active case for draining and refilling several times (and ceaseless the transmission through its paces between) in order to turn the tide on the old liquid. The more times one repeats the process, the smaller the share of old fluid remains. Draining an engine of oil when someone feel good makes a lot of sense, but I don’t see how it makes a big difference with low viscosity ineluctable transmission fluid. Honda has come out with a new ATF DW-1 fluid that offers improved remote transmission performance and improved fuel conservatism, compared to the original ATF-Z, which has been discontinued. The new Honda specified flexible can be mixed with old in any ratio and isn’t too pricey at about $7.50 per quart.
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