Berry Motor Group , we dont like Viking afaik but talk to Mark at BMG and ask him about them if you are close....
It is well worth travelling to BMG or Voldat , any advice you have been given is by fools who know nothiong about Volvo and WILL DESTROY your XC90-V8, really , it is too easy to wreck that motor IF they dont care to read up about it AND have Volvo VIDA and Dice to access the computers only very expensive analysers will read the Volvo computers and most hack mechanics dont have them.