yes it is common to have squeaks with urethane bushings. the antisway bar bushings are what always squeaked on my car. take some wd40 and spray them good then push up and down on the car a few times and see if it goes away. it usually does on my car. lasts a while then I spray it again. I finally ended up changing to midolyne bushings. they still squeak but not as much or as often.