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He is way off base. contaminants get into the tranny through the breather, the oil degrades, etc. It has a limited life.
There is nothing to slip except synchronizers, and that only if you put GL5 oil in, add more additives, or use an oil too thick.
That is an old wives tale about automatic transmissions. But it is still wrong there, but based on the fact that if you go way too long on ATF, especially the cheap stuff, the new oil has to clean up the mess from before, but you fix that with two oil changes, a week or two apart.
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