How are you all defining a "flush" of the transmission fluid? This mechanic recommends it periodically, but warns about making sure they do it right:
http://autos.aol.com/article/fluid-flush-fallacy/
Let's start with the automatic transmission -- the most frequently flushed fluid besides the radiator. The advent of the transmission fluid exchange machine was a great step. In the past, automatic transmission fluid could only be changed by removing the transmission oil pan, which only holds three to six of the eight to 10 quarts in the transmission. The second you started the car, the new fluid mixed with the old, eliminating much of the benefit of the service.
The fluid exchange machine, which some people choose to call a flush machine, cuts into the transmission cooler line at the radiator. As the car runs, old fluid goes out into the waste tank while new fluid is simultaneously pumped in. If the shop is really thorough, the car is lifted and actually driven through all the gears while the exchange is taking place. And if the service is done properly, the transmission oil pan still has to be removed and cleaned and the filter replaced -- a solid hour and a half of work. So if a quick-lube shop is offering it to you in 35 minutes, something's not being done.
The fluid exchange machine, which some people choose to call a flush machine, cuts into the transmission cooler line at the radiator. As the car runs, old fluid goes out into the waste tank while new fluid is simultaneously pumped in. If the shop is really thorough, the car is lifted and actually driven through all the gears while the exchange is taking place. And if the service is done properly, the transmission oil pan still has to be removed and cleaned and the filter replaced -- a solid hour and a half of work. So if a quick-lube shop is offering it to you in 35 minutes, something's not being done.
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