The head of General Motors'
Forster told a small group of people today that he is leaving, one of the sources said.
The son of a German diplomat and former BMW
While he may have been someone who avoided conflict in favor of mutual solutions he was an outstanding car expert and vehemently intervened in the development of new models like the Corsa, Insignia and Astra, a company source said, who described the departure as a loss for Opel.
Forster spoke out in favor of the Magna deal just days before the board met to approve the sale in mid-September, irking his superiors in Detroit.
Carl-Peter Forster nailed his colors to the mast of Magna, said an Opel labor representative.
German news portal Spiegel Online reported that Bob Lutz, a veteran GM executive, who is now head of group marketing, would become chairman of Opel. GM declined comment.
Opel said Forster was still chairman and an announcement would be made should there be changes.
Rising management star Nick Reilly, former plant director at Vauxhall's Ellesmere Port plant in northwest England and current head of GM's international operations, is set to lead GM's looming reorganization of Opel.
Nick Reilly is more than capable - someone we've got some respect for since the one thing he did have was integrity. But I don't think he's the sort of person who would make a decision based with any affinity for any one country, the labor representative said.
Reilly, a Briton, had worked as sales and marketing chief for GM Europe in Zurich before moving to Asia to run GM operations there.
GM left leaders in Berlin and Moscow seething this week when it dropped plans to sell a 55 percent stake in Opel to Magna and its Russian partner Sberbank
GM will instead restructure Opel itself in a 3 billion-euro revamp it wants countries with Opel plants to help finance.
The goal is to cut fixed costs at Opel by 30 percent -- in part by chopping a fifth of Opel's 50,000 staff -- but details are scarce.
There are signals from the company that GM will explain its plans next week. The German government is waiting for this explanation and will then evaluate it, German government spokesman Christoph Steegmans said in Berlin.
Separately, the economy minister from the state of Thuringia told Reuters that Free Democrat (FDP) politician Dirk Pfeil, a critic of the Magna deal, was being replaced on the trust body that has overseen Opel since GM briefly dipped into bankruptcy.
The minister, Matthias Machnig, said the four states with Opel sites had agreed that Pfeil needed to go because he was not representing their interests.
Russian Prime Minister Vladimir Putin has suggested the Opel Trust -- not GM -- should have final say on the sale, but the Trust has said it did not need to approve GM's decision.
The Trust, which controls a 65 percent stake in Opel, will dissolve once GM repays to Germany the rest of a 1.5 billion euro ($2.23 billion) bridge loan due by the end of the month.
(Editing by Greg Mahlich and Simon Jessop)