The rescue of General Motors Corp.'s (GM) German Adam Opel GmbH unit has been a singular case and although the bailout is justifiable, it's not without risks, Germany's Chancellor Angela Merkel said Tuesday.

"I stick to this, we had a special case in the case of Opel," Merkel said at a conference organized by the Initiative New Social Market Economy, or INSM. "I don't see any such second case."

She also said Opel now has to be able to get by with the guarantees provided to the Ruesselsheim-based carmaker.

The German government Saturday selected Austrian-Canadian car parts maker Magna International Inc. (MGA) as a partner for Opel and agreed on to provide EUR1.5 billion in bridge financing from the federal and state governments, paving the way for a takeover by Magna and its two Russian partners.

-By Andrea Thomas, Dow Jones Newswires; +49-(0)30-2888-4126; andrea.thomas@dowjones.com