I'm running the KYB Sr 4090 complete struts. After a while I get an incredible amount of a metallic squeal. Not sure how to explain it but it sounds like squeaking metal parts that are rubbing each other or something like that. This is the second strut I've had to have replaced. At first I thought it was something to do with the car, but I had the same thing happen on my other Aurora as well. Usually the noise goes away when I spray it down with WD-40. These are brand new struts and I shouldn't have to do that. I'm actually really frustrated because I have to replace another strut tomorrow.