My dealer charges $125.00 for a B&G Tranny Flush for any Volvo. It does not include a filter change. NAPA sells a tranny service kit for your S80-T6. It is a GM tranny and you get a filter and gasket for under $15.00.
I flushed my tranny myself. it is a little messy when you drop the pan but not really hard. I used 15 quarts to be sure I got all of the old fluid out. Fluid is cheap, tranny is not.
Do it every 2 years or 24,000 miles. This is the GM schedule.
At least you will know better next time...
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