Rumors of a collaboration between Apple and BMW are heating up.

According to a recent report, Apple CEO Tim Cook visited BMW’s headquarters last year along with senior executives from the Cupertino-based company, taking a tour of the German automaker’s factory in Leipzig to learn more on how BMW manufactures the i3 all-electric vehicle. The visit ended without any sort of collaboration, with Apple wanting to explore developing a vehicle on its own, however that could all change in the future.

Since Apple’s visit to BMW, the automaker has seen new Chief Executive Harald Kreuger take position and Herbert Diess, who played a role in the initial talks with Apple, moving onto a position at Volkswagen. It remains to be unseen whether Kreuger will explore the idea of collaborating with Apple further and how Diess’s departure affects the potential relationship.

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During the visit, a senior BMW source said, “Apple executives were impressed with the fact that we abandoned traditional approaches to car making and started afresh. It chimed with the way they do things too.” That of course makes reference to the BMW i3, which was developed from “scratch” as an all-electric vehicle.

Rumors of an Apple iCar have been circulating for years now, but more speculation has surfaced in recent months as the company has been spied testing its own vehicle. In addition, Google isn’t holding back in developing its own self-driving car and Apple sees the tech-giant as one of its main competitors in numerous markets. It is believed that if Apple wants to develop its own car, it will likely enter or at the very least, seek a partnership with an existing automaker.

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