I had a squeak from the strut too or so I thought. I took the Z cover off and greased the underside every where it makes contact with the strut bar, that got rid of about 50% of the squeak. I tracked the rest down to the poly moulding under the boot floor that sits around the jack and spare wheel, the jack was rubbing on the moulding making a squeak. Was also squeaking from the tailgate latch loop that had come a bit loose, removed the tailgate lining and tightened the screws and all quiet.