I have a 2004 Z4 3.0 with 13k miles. Have had the car for several years and have noticed a steering issue that seems to be getting worse. I researched this on multiple forums and it appears that there are numerous examples of similar problems. Most relate to issues in hot tempatures, mine is more related to speed. Problem was very noticable last evening at 70 degrees. Here are the symptoms... At low speeds (under 20mph) steering is very light and smooth, no issues at all. As speed increases, the steering gets heavier (as it should) but develops a "detent" at straight center. The faster the speed, the more effort needed to overcome the detent resistance, to the point that it becomes easy to oversteer the car. This can be real scary during avoidance maneuvers and quick lane changes. Sorry if I am repeating an old thread but I have not been able to find an answer. Thanks for any help!