I did a cooler line fluid exchange on the XC yesterday. 211,000 and the last change was at 180,000.
Drained the fluid from the transmission, added 3.5 Qts. Hooked up the hose, pumped out two QT, added two, and repeated the process. After about 8 Qts, the fluid, which was already red, got noticeably more clear and bright in color. I did the pump & refill twice more, for a total of 12 QT in the exchange.
Shifts perfectly.
It's been 100,000 miles since my valvebody work, and the regular fluid changes, along with the external cooler, have kept the transmission alive and well. I've not added a magnefine filter, but the magnetic drain plug had very, very little on after 30,000 miles, so the wear on the steels inside the transmission is minimal.
But as I was doing this, and it took me about an hour, including getting out the ramps, removing the splash guard and doing the work, I thought of my 850 wagon, which got the first flush on the AW-42 at about 165,000. That fluid came out absolutely black and horrible. With new fluid in it, it ran perfectly for the rest of its life, despite all the old wive's tales about old fluid keeping a transmission together and the admonition not to change it completely.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, 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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