When I bought it, it had the infamous red sludge from the standard BMW synthetic oil changes. Prior owner was not diligent in oil changes, subscribed to the BMW extended OCI. I immediately started using Red Line in it and did short OCI‘s to clean it up. When I had to replace the valve cover gasket, my tech took this photo. He was amazed. It runs better than when I bought it. In-line six BMW engines run even more smoothly with Red Line in the crank case. Thus will never use conventional/group 3. I own / not lease. ;-)