Whether or not to have transmission oil flushed/changed?

Of course, this is the best way to destroy a transmission. It's like a doctor saying: why would you quit smoking, you will die anyway... Not true. I have serviced many Volvo and other transmissions. Fluid change is necessary to get more life out of the transmission. The S80's GM tranny even more sensitive (I have replaced few also) for maintenance. Get the ATF changed - I'd suggest a complete flush with the CORRECT ATF!! and here comes the important thing: RESET THE ATF COUNTER! Believe it or not, the transmission will adjust the shift time to the new fluid. Cool, ha? The bad thing is, you need Vadis , Vida or Dice diagnostic system to be able to reset it. The dealer or Volvo specialty shops should have one. Zee

Great analogy Zee! And great advice too! I suggest you find another shop, this dealer is offering poor advice on what to do with a poorly serviced vehicle (That they sold you!). Look for another Volvo shop in your area here: http://repairpal.com/volvo-repair-in-round-rock-texas