Chairman and CEO of the Renault-Nissan A

Nissan and Daimler have been partnering ever closer for years, and now an unnamed source has told Reuters that the automakers have agreed to a 50-50 joint venture in Mexico that would build Infiniti and Mercedes-Benz models. Given that the rumors about just such a deal go back nearly six months and similar rumblings are years old, this arrangement has been a long time coming.

The insider tells Reuters that a memorandum of understanding was signed between them last month to build the Mercedes GLA-Class and new Infinitis at Nissan's Aguascalientes factory. The rumor didn't say when production would begin. It wouldn't be the first time the two automakers have decided to share this platform – Infiniti will build its Q30 compact on it in the UK next year.

The partnership between the Renault-Nissan Alliance and Daimler goes back to 2010 when the companies signed an agreement to share engines, factories and platforms. Since then, products of the partnership have included the underpinnings for the next-generation Smart and Renault Twingo and shared engines among some other models.