depends on the what kinda service you are going there for. if its just change oil i think some shops like speedyfix can do it for you. im not sure about this though. but ive read somewhere that there are some european car shop who specialize on benzes and bmws
you can try European Motors along Libis, Quezon City. it is located after the Honda cars dealership, at the back of Floor Center, yung bilihan ng tiles.