A viable solution for General Motors Corp.'s (GM) European car plants is in the common interest of all European Union countries, E.U. ministers said Friday after meeting to coordinate plans on a bail out for troubled GM unit Adam Opel GmbH.

The ministers agreed that E.U. rules ensuring a level-playing field for companies throughout the 27-nation bloc must be fully respected and national measures should not be taken without coordination with other countries involved and with the European Commission.

Industry ministers from 18 members states met with European Commissioner for Industry Guenter Verheugen and Competition Commissioner Neelie Kroes.

-By Peppi Kiviniemi and Carolyn Henson, Dow Jones Newswires; +32 2 741 1481; carolyn.henson@dowjones.com