Echoing Riverbend's experiences, I've had the best luck with plain ol NGK copper core plugs. The last time I bought any they were $2.50 each. If you purchase Volvo label plugs from the dealer, that's what you'll get, although they may be manufactured by Bosch. Of course the autoparts stores will tell you that the latest designer plugs are the only way to go. Tell them not waste their breath.
Torque to 22 ft/lbs. A smidgeon of anti seize on the threads isn't a bad idea.
I'm running these in our 2.5T and 2.4NA with absolutely no issues:
http://www.sparkplugauto.com/ngk/resistor-en/ngk-resistor-bkr6es-spark-plug.html
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