general problems of the 2008 BMW Z4

Very erratic steering. Crossing the crown of a road will pull one way and then quickly pull in the opposite direction unlike anything I have ever driven. Also same effect with trying to stay in lanes with any common deviation. This is worst at hwy speeds but does occur at lower speeds as well.

Just bought a used 2008 Z4. Cannot drive straight line, car goes all over the road. Steering has "stick-slip" effect. Car wanders from right to left and left to right. Got rubber elements in front axle replaced, 4 wheel alignment, . . . , no change. Appears to be a power steeriung issue.

While turning on a constant radius clover-leaf on-ramp (right or left), a sudden change in steering angle was required to avoid an obstacle. As the electrically-assisted steering was quickly adjusted, a flat spot (or a heavy spot or a delay in boost) in the steering wheel/feel was encountered. In other words, more force was required than expected to quickly change the steering angle. If this is normal, it could interfere with emergency maneuvers to avoid obstacles. Personally, I find it to be unsafe as the steering feel is unpredictable. This unpredictable steering feel occurs anytime I need to make an abrupt change in steering angle.