GM’s recently renewed focus on its luxury lines doesn’t just mean introducing hot new models like the Cadillac CTS. It also means improving creature comforts, like standard XM satellite radio on all Cadillacs. Now the biggest U.S. auto maker is turning its eye on Buick, Hummer and Saab, making XM satellite radio a standard option for all of those marques’ models as well.

The deal includes the hardware necessary to receive transmissions and a three-month trial subscription. Rates start around $12/month, with prices expected to dip if the merger with Sirius is completed. Of course, the service is only officially available in the U.S. and southern Canada, so only models made for sale in North America will get the standard upgrade. No word yet if other markets will get similar deals with their local satellite radio services.