GM's insolvency could lead to Opel's collapse or at least delay its product development, Automotive News Europe reported Sunday.
"You cannot separate Opel and GM. They are in the same boat, if that boat has a problem they will both sink together," said Ferdinand Dudenhoffer, professor of automotive economics at the University of Duisburg.
If General Motors' financial woes worsen, Opel sales will suffer, Dudenhoffer said.
"It will be very difficult to have a successful launch for the Insignia," the company's new upper-medium car that is replacing the Vectra/Signum, he said.
Stefan Bratzel of the Center of Automotive at Bergisch Gladbach in Germany said the GM situation is dire for Opel.
"The situation is perhaps the most serious in Opel's history," he said. "They have problems with their finances, problems with falling markets and the parent company in the U.S. is unable to help. This is a really dangerous situation."