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I watch Scotty all the time and appreciate his advice, though sometimes he is short on details. One major question I had was why is a transmission flush bad even on lower mileage cars. I understood why it could be bad for high mileage situations since something like clogging with the sediments could occur, but Scotty, and your very helpful page here never go into why a flush is not recommended even for lower mileage, and there are no details or mechanics of why. If some people as you say even do a series of changes at one time to get most of the fluid to be replaced isn't that almost tantamount to what a flush does? This makes me think it might be high pressure of a flush that does it all at once, where doing sequential "changes" is less violent to the system. I'm only guessing, but would be curious to know what your knowledge or reasoning on this was based on. Thanks.