I notice that when the weather is cold (below 40 degrees), my 535iM emits white smoke from the exhaust. Now, I've searched this topic and found that it could just be condensation because of the exhaust system being so complex. However, it seems like my car smokes the most of all cars on the road when I drive. There is sometimes tons of smoke and it drifts and surrounds the car at stoplights. The smoke doesn't smell, and it's very light. Also, I'm not loosing coolant, and the engine seems to be running smoothly. Is this just condensation, or something more sinister?