Nissan’s luxury brand, Infiniti, will launch a new compact car in 2014 using the same platform as Mercedes-Benz’s B-Class, unveiled at the Frankfurt show.

Infiniti also will use Daimler’s four and six-cylinder petrol and diesel engines in its next generation G class from 2013 as it looks to grow sales in Europe where fuel-hungry V6 and V8 petrol engines are now mostly out of step with buying habits.

No decision has yet been made on where this new car will be built but it is thought likely it will be outside Japan – Nissan now sells more cars in China alone than its homeland.

Daimler and the Renault-Nissan Alliance signed a co-operation agreement last year aimed at cost savings.

Carlos Ghosn, head of both Renault and Nissan, said this latest development marked a deepening of the partnership. The companies also agreed to use Renault motors and Daimler batteries for electric versions of Daimler’s Smart and Renault’s Twingo, which will also be based on the same vehicle architecture.

“Our strategic cooperation is moving on a fast track and has now extended well beyond the original agreement,” Ghosn said at a joint press briefing with Daimler boss Dieter Zetsche.

Answering questions from journalists, the two men said that they were talking to each other about how to work together and no region was off limits in terms of where the new compact Infiniti could be built but they were anxious to make sure investments did not overlap.

The two CEOs have previously announced that three- and four-cylinder engines built by Renault will be made available to Mercedes-Benz for its Smart and A-Class models and be built by Renault in France.