Look at volvospeed.com in the front wheel drive maintenance section. They emphasize that regular ATF changes are very important for longest transmission life. A Volvo tech at a dealership told me that he drains and refills the transmission sump on his own Volvo at each oil change...every other oil change is likely fine.
So, for your car...I'd drain and refill the transmission sump, add 6 ounces of Auto-Rx, drive for 1500 miles, and do a complete transmission fluid flush and renewal. I'd also add an ounce of Auto-Rx to your power steering and flush and renew the fluid (ATF) in that when you do the transmission. If your Volvo calls for Volvo's own ATF, Redline D4 is a synthetic ATF that does an excellent job. If your Volvo calls for Dexron-III ATF, use your choice...I prefer the synthetic, and Mobil 1, Redline, or Amsoil are excellent. After the cleaning and refill with conventional ATF you're good for at least 30,000 miles or 50k with synthetic. I'd send a sample to a testing lab then to find the remaining life in the fluid.
My Volvo 850T runs better, gets better gas mileage, and consumes less oil after an Auto-Rx cleaning of the engine.
I also renew the brake fluid every two years, the coolant every two years, and have almost no repair costs.
Has your ABS controller failed yet? It will. There is a guy, Victor Rocha, that does an excellent job of rebuilding them stouter than new.
http://home.earthlink.net/~vicrocha/Volvo_Parts/Volvo_V70_ABS.htm
Ken