turning on the steering wheel stiff(certainpointsinturns)? why?what?possiblefix?

The issue you are experiencing is most likely due to the steering shaft from the steering wheel to the steering rack. It has multiple joints in it and one or more of them may be starting to bind with age and wear and tear. I would recommend having it inspected when you can to verify that is the issue. In terms of safety it is not an absolute emergency but the longer is goes the worse it can get and may make the steering much more difficult. If it does start to get like that it can become more of a safety issue if you are in need of a quick turn to avoid an accident. If it is the steering shaft normally the only way to correct the issue is to replace the shaft itself. If I remember correctly BMW does not off a rebuild kit for the steering shaft, only a replacement shaft assembly.