If going for a v70 then check cam belt and tensioner has been replaced at the correct interval
Also check rear pads as they can disintegrate and really foul your day up
I've had lots of Volvos on the trot and they are much more reliable than mercs, my 2011 xc70 has almost 100k on the clock with just one split turbo pipe early in it's life as an issue
Try to find a manual at geartronic valve bodies not great, also mpg of manual much better
Consider non turbo petrol for proper reliability, not much less economical than auto diesel