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They would stand to make more, but they also open them selves up to a lot more liability.. Better to call it life time fill and replcae it once every 100K I would think.. I'm sure they have had their share of techs messing up a trans fluid change only to have the customer come back demanding they replace their transmission.
Way I see it why not give the transmission best chance possible of lasting.. Hell, I know people who don't change their engine oil for 40-50+k..their engines all make it to 100,000 miles so what's to say we shouldn't all adopt that interval?
Jonathan
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