Quote:
Originally Posted by Stillrunning
I've always done it on my used vehicles and had no problem. I think it's bunk if you think that somehow dirt is holding your transmission together. Would you change the engine oil on a used car?
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What I have read, but admittedly cannot substantiate, is that it is not good to flush the transmission. The concern raised is that flushing may dislodge some debris which could get caught in a valve body or some other part of the transmission. After doing some further research, I discovered that there are a lot of opinions out there on this topic. I found this link below. It has some good information and explains several types of transmission flushing machines.
Transmission Flush Scare
I also found a DIY procedure to flush the transmission:
DIY flush transmission fluid
I plan to give it a try and will post back with a modified procedure.
EDIT: Stillrunning is correct! If you only drain and fill the transmission, the existing dirty fluid in the cooler and torque converter quickly contaminates the new fluid that you just added. After running the vehicle for only a few days, I noticed that the new fluid was looking brownish again. Note that it only take about 15-20 minutes and an extra 6-8 liters of clean fluid to get all of the old fluid out. In hindsight, I would recommend the removing the transmission cooler lines in order to get all of the dirty fluid out. It is a much better method in my opinion than just draining the transmission. I have updated the above procedure to reflect this.
