Update: it turns out that OSRAM is the supplier of those OLEDs
A few weeks ago, BMW unveiled their latest top-of-the-range racing-grade road car, the Concept M4 GTS, that has OLED taillights. BMW has announced now that they are starting to produce this car commercially - but at very limited quantities - in fact only 700 will be made, and deliveries are planned to begin in March 2016.
So this will be the first commercial car with OLED lighting - although this really very limited production so I'm not sure if it counts. A few days ago Audi announced their intentions to be the world's first automaker to launch a car with OLED taillights - but I think BMW will now claim that first. BMW actually always targeted 2017 for their first OLED car, so it's great to see them release this new technology ahead of schedule