Quote:
Originally Posted by Lubehead
Let's not confuse flush with change. No flushing machine should ever be connected to these transmissions. Changing the fluid requires dropping the pan which has the filter built into it. So a new pan/filter is part of the process. Get it hot, drain and refill taking care to follow OEM's recommendations regarding proper level at specific temperature. These transmissions should not be flushed period.
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Where is this information coming from? Official ZF transmission service (i.e. in Germany and a few other places) will flush all the old fluid out. Included will be a filter change. Why would replacing ALL the fluid be a bad thing?