I have a 2004 XC70 that has been a wonderful car over the 15 years we have owned it. It now has 170,000 miles and I have replaced a lot of parts over the years keeping it in tip top shape. Looks new inside and out still. My question is about the transmission. It is still original and I have taken care of it. I had the dealer flush it with a machine at 50,000 miles when we first bough it used as a lease return. Then a drain and fill at 81,000 miles in 2012. Then I found out about the Gibbons method on this forum and started doing those. So my transmission has been serviced like the following:
-50,000 miles-dealer flush machine(100% new ATF
-81,000 miles- drain and fill on 2/2012
-85,500 miles-Gibbons method with 14 qts on 7/2012
-115,000 miles- Gibbons method with 12 qts on 12/2015
-145,000 miles-Gibbons method with 12 qts qts on 6/2019
-171,000 miles-Gibbons method with 13 qts on 8/2022

So I try to do it about every 30,000 miles now. It always comes out a nice red color but not clear like new fluid. I use Toyota T-4 ATF. Its my wifes car and she is gentle with it and it has always shifted smooth and flawless. Based on this, how long do you think my transmission will last? How long do these go for with good maintenance. The first picture is the old fluid that came out in the beginning of the gibbons flush. The second picture is the last ATF that came out after 13 qts went through. Least couple pictures are the car.