Why is my BMW 5 Series producing smoke from the exhaust?

I recently noticed that my BMW 5 Series is producing smoke from the exhaust. It seems to happen more often when the engine is under load. What could be causing this?

There could be several reasons for this. First, it could be an indication of burning oil, which could be caused by a leak in the engine oil system. Another possibility is that the fuel mixture is too rich, which could be a result of a faulty oxygen sensor. I recommend taking your car to a mechanic for a thorough inspection.