contaminated fluid isn't going to hurt anything. I don't think I'd ever pay to have ATF changed though. I don't want any sort of flushing and I'd want to put the fluid in myself to know it's getting the right stuff. Drain and replace. It doesn't matter that you don't get it all at once. Do it regularly and the fluid will always be in good condition: low on contaminants, at the proper viscosity, and with functional additives. I like the ones with a drain plug where I can just drain and replace a couple quarts every second oil change or so. $5 and 5 minutes a year to keep the fluid fresh. My theory regarding the "fluid change causes problem soon afterwards" scenario: Many fluid changes are instigated by the owner noticing that the transmission doesn't feel quite right. So they get a fluid change hoping this will magically fix the problem at minimum cost. When it craps out shortly afterwards the fluid change sometimes gets the blame. What really happened was the transmission was starting to fail and the fluid change made little or no difference. Original Poster Here! There are a few issues at play, and I think you've all mentioned them. 1) Bias to change the fluid only once a problem is detected. GUILTY on my 2003 TB....I did the change 2 months ago, slip got worse, cut my losses, driving a new 2012 Camry now. 2) The 89? Sub, '94 TB were used car lot