my rear upper strut mount squeaks on one side--no damage, but it squeaks non stop---eeeee--ee-e-e-eee, even when just sitting there idleing, but more while driving. And it's not the mount itself--it's where the mount bolts to the body--there should be a gasket there, and they get old and then do not serve their purpose--you can check this by loosening the bolts, jacking up the car and spraying some lube/oil inbetween there. I used silicone spray--but it only worked for a day! doh!