 Complete the following phrase:  The BMW M6 GTLM is an endurance grand tourer GT car constructed by the German automobile manufacturer BMW. The car was announced to be under development, through a press release in October 2015, following the announcement and unveiling of the BMW M6 GT3, although few of the cars technical specifications were revealed. The car was based on the BMW M6 GT3, and the car had its initial shakedown and testing conducted by BMW Team RLL, at the Sebring International Raceway, in Florida, during early November 2015. The car had its race debut at the 