2014 ford fusion around 108k miles. So I was looking at this fusion today and whenever there would be any sort of travel in the suspension it would creak like an old wooden bed. I sprayed some pb blaster under the spring and it stopped creaking for a few seconds. What part would be causing the creaking? I think almost all of the rear suspension is original so any part could have gone bad but I'm almost positive it has something to do with the springs.