I've had very fine results with Zymol Concours. The results are spectacular ( on a silver car ).I have been using Autoglym Resin Polish on my M Coupe and X5. Also with good reusults, more durable but not as spectacular. Zaino I have heard is not to be used as it is a total synthetic with potential problems with the paint. Users of the Zaino products all tend to use on American car finishes . Maybe better results because of different paint chemistry. I would not use this product on any BMW.