If you have the Geartronic transmission, using anything other than the Volvo transmission fluid will harm the transmission. It is a very special blend, and the only thing that can be used in these units. If your dealer is telling you otherwise, you need to go to another dealer that knows what the hell they are doing. Mobil 1 doesn't even make a fluid for this particular transmission
http://www.mobil.com/USA-English/Lubes/PDS/NAUSENPVLMOMobil_ATF_3309.asp
On the '01' Geartronics, if you notice, Volvo has decided that the ATF is a 'non-consumer serviceable' item and they have all but hidden the ATF dipstick. Also, they state that the fluid change interval for these transmissions is between 75k and 100k. (Perhaps the reason they fail?)
Regardless - don't fall for it. Call another dealer and get another opinion on this issue.
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