Spooky coincidence, I posted a similar question in the General area
http://www.volvoforums.org.uk/showthread.php?t=145965
It does seem there's some conflicting information (from manuals and handbooks) about the type of fluid required and I wonder if this is one of those cases of it depends on the precise model and date of manufacture? I'm gooing to try dipping the reservoir before I go any further.