So lets hear it guys. Can a car with 99,000 miles have the transmission flushed? My boss bought a 1991 acura legend, and his mechanic will not flush the tranny because it has over 90k and they believe it will harm the seals. Anyone experience a problem after a flush?

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual