General Motors' ailing European unit Opel aims to strike a deal with labour unions to close the Bochum plant after production of the Zafira Tourer van ends in exchange for guaranteeing German jobs through to 2016.

Opel's management, the IG Metall trade union and the works council representatives of the German plants will continue negotiations in the coming weeks in order to reach an agreement over job cuts, wages, building a wider range of models, and a deeper expansion into export markets.

"Opel must structure its business in such a way that it is also profitable in a difficult market environment. It would not be responsible were we not to act in view of a 20 percent decline in the European car market versus 2007," Opel chief executive Karl-Friedrich Stracke said in a statement on Wednesday.

The company said the goal is not just to reduce costs but 'to lower the dependence on imported vehicles and parts'.

Reuters reported on Tuesday that GM's board of directors was expected to decide on the closure of the Bochum plant as part of a business plan through 2016 that will be presented to Opel's top labour leadership on June 28.

Under the compromise, GM and Opel would be able to reduce its fixed cost base by letting Bochum wind down its production when the Zafira Tourer's life cycle ends, generally expected for the end of 2016.

While this would cost the jobs of 3,300 people currently employed in Bochum, management had relinquished considerations of ceasing production in 2015 when a current labour deal protecting the 20,000-odd German workers at Opel's three car plants and one component plant.

As part of the talks, IG Metall is prepared to discuss the 'implementation' of the recent collective wage bargaining deal, which foresees hiking pay by 4.3 per cent over a 13 month period retroactively from May.

This would imply the union is prepared to accept a deviation from the industry-wide deal, either by paying less or delaying the date for the hike.

In doing so, labour hopes that the talks would allow job guarantees to be extended another two years through the end of 2016.

Opel reaffirmed plans to run all of its European plants in three-shift operation at full capacity. Company sources have confirmed that the company's cost base would ideally require it to build 500,000 more cars than it manufactured last year.

The carmaker pledged to look into shifting overseas production back to Europe. Opel currently imports the Antara sports utility vehicle from Korea, which will also begin exporting the smaller Mokka subcompact SUV to Europe come October.

The higher output in the remaining factories would mean roughly half of the planned investments through 2016 would be made in Germany, home to just over half of Opel's workforce.

"Opel remains a central pillar of our global business and i am absolutely convinced that we are on the right path," GM vice-chairman Stephen Girsky said in a statement.

Wolfgang Schaefer-Klug, Opel's top Labour leader since January, expressed support for the deal but said 'many points still must be negotiated'.

IG Metall boss Berthold Huber said the talks based on a preliminary plan showed both sides were accepting responsibility for the losses at Opel, which abandoned its plans to achieve profitability this year amid a severe drop in the market.

"We expect that the management of GM and Opel do not simply pay lip service to the plans but support them with the necessary investments," he said in the statement.