I am just wondering if anyone can help me out please on this small problem.
On my X5 40d M Sport (M Sport Suspension Deletion), whilst travelling over rough surfaces/bumps in the road its what i think is the suspension/damper gives a single high pitch squeek noise. It cannot be heard when the windows are up but on a warm day its incredibly annoying as you can hear it quite loud and its embarrassing for me as members of the public will be able to hear it as i drive past !
It seems to be coming from the passenger side of the car, I have been under the car and sprayed everything behind all 4 wheels with silicone lubricant spray and had no luck. Its been happening for the past 3 months and ive just about had enough now and i want it sorted

Has anybody had this problem before or has anyone got any tips or advice for me please?
Thanks all.