Pretty much the same thing you would look for on your 850. Biggest difference is that this car has an electronic throttle module (etm) which is known to go bad, but Volvo has extended its warranty to 10 years or 200k miles, so that should be no problem. If it hasn't already had the etm software upgrade (free from dealer), make sure you get this- it helps extend the life of the etm and most of those who have had it say the car drives better with more power. Good luck! Nice car!
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1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.