VW Group's listing of Porsche has prompted speculation that the automaker's other brands such as Audi could also be put on the market.

With electric cars poised to take over the market, automakers must decide whether to repurpose combustion-engine plants, close them or find partners to develop and build increasingly less-relevant technology.

The comments come following a report that Ferrari had been the victim of a cyberattack and seven gigabytes of documents, including internal ones, data sheets and repair handbooks, had been made public.

Skoda, Toyota and Mercedes were big winners as French new-car sales rose by 5.5 percent for September. For the year, registrations are still down 12 percent.