Originally Posted by
nelaco
I once made this mistake. I replaced all of the fluid at once on a transmission with about 70k miles with original fluid. A month later and about 3k miles it failed on me. Had to get a new transmission. Nothing was wrong BEFORE I replaced the fluid. Obviously I had waited too long to do this. The new fluid dislodged a bunch of build-up and clogged the little passages. The idea of a drain & fill 3 times with 200+ miles in between is that only so much can get dislodged at a time with only 3 or so quarts of fluid being new. Plus, anything that did come off is being drained soon after.
After this is done at least 3 times, only then I would do a full flush.
I think you're confusing correlation with causality. The flush didn't cause the failure, even though it immediately preceded it. The wear already happened before the flush, and it was on its last legs anyway....
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (130K, Michelin AS4, HPL 0W40)
2005 MB SL600 (58K Michelin AS4, Mobil 1 0W40)
2004 V70R (147K, six speed M66, HPL 5W40)
2004 XC90 (247K, HPL 0W30 Euro)
2002 V70-XC (300K, HPL 0W30 Euro)
2002 V70-T5 (230K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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