Here is an article about the issue:
https://volvo-p2-stuff.blogspot.com/202 ... water.html

I appreciate the feedback. The brand is Febi Bilstein. No grease or corrosion on threads or washer. The car was on the jack when I torqued. Yes, I also think it is strange that this happened. Could it be that my torque wrench is inaccurate? I remember that when I mounted the ball joint I had that fe...

I discovered that I had to replace the front right ball joint, and did so. When tightening the lower aluminum nut I used the torque specs - 50 Nm + 40 degrees. One month later I started to experience oversteering. I discovered that the lower nut had loosened completely. I decided to torque it to 100...