After thorough research, I decided to have my F30 timing chain issue solved by German motorworks. I admit, it was a risky move to "test" a shop's skill and capabilities. If I had not had a box with the old parts and a video/pics handed to me, I would have not guessed the engine was touched. No tool marks, no fluid drips, no new scratches on anything!!! I waited a year before posting my review. This way I can honestly say that besides great customer service, German motorworks perfectly performs high quality complex engine work. At this point, I am totally confident that German motorworks is the best automotive service outfit in the Nashville area.