as i was playing with an m5 on the motorway today,my car started to loose its power and sounded like it wasn't running on all cylinders,next thing clouds of black smoke come out of the exhaust,pulls over flipped the bonnet and theres oil all over the place,the dipstick had been blown out,managed to tow my car home,so has anyone got any ideas as to whats happened?and is my cosworth fooked?