My hydraulic mineral oil is leaking down under somewhere and causing smoke.

Greetings, It is very difficult to determine how complicated a repair or how much it would cost without first determining the source of the leak. The best thing to do is for you to bring the car in so we can check it out and then we would be able to provide you with an estimate on the cost of repairs. Kind regards, Stephane Grabina BMW Excluservice Rockville, MD 20852 www.bmwexcluservice.com 301 231 5400 ext.1