I have had a squeak appear on the rear passenger corner of my 2013 E92 M3 ZCP. Its a weird squeak, not like a normal suspension creak, but a parakeet-like chirp. I removed my rear shocks and inspected them, no wetness, and when I compress them outside of the card they rebound normally and extend to full length. I put them back on the car, and made sure everything is tight in the process. Should I be lubing the shock mounts and bump stops etc? Is that a thing? What do you guys think?
Here's a video of the sound.