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Originally Posted by dcrusupra
Its recommended but you dont have to. If the trans has over 100,000 miles on it and its never been done, I wouldnt even touch the fluid. Chances are that's what's holding it together.
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This is very true. I used to rebuild trannys. New oil will clean out all the sludge and varnish, and then it will start leaking oil.
We use the BG chemicals and flush at my shop, with the machines. But we won't do one that has a whole lot of miles on the oil.
In these cases, I'd just do it the old fashion way, and change the filter, and reload with oil. You'll only be changing 2.5 qts that way.