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I've heard some people say that completely flushing the fluid and changing it sometimes causes problems because the new fluid is abrasive. I dont really believe this.
I had my fluid changed at 100k and it was dirty as hell - dont know how often the old owner flushed it. It wont be as good if you flush it yourself since the mechanic will use a machine that vacuums the old stuff out and pumps in the new. That is, unless u have your own machine.
I think my trans would be in much better condition if it had been changed every 30k miles. This is for auto....i envy those with manual.
Keep in mind i dont know sh!t about cars, just my opinion.
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