Search " haldex Oil change" or similar. The job is very straight forward - you just need a vacuum pump ( Halfords / screwfix or similar)
Tyr this site
http://www.matthewsvolvosite.com/for...ic.php?t=30549
I'd use Volvo dealer fluid - you know it will be right and it comes in 1 litre bottles not 300mg tubes as illustration.
good luck
Cheers
Bob