Look at it yourself for free. Jack the car up, put a jack stand under it.Look at the strut itself for it leaking fluid. If not, grab the bottom of the tire and lift up, if you can move the strut by lifting the tire the strut needs replacement. Always do both if so and get a alignment right after. Otherwise, go to any Sears Auto center (Woodfield Malll)and ask for a suspension evaluation. Its free.... They will check your ball joints, struts, schocks,springs, tie rods, ends link sway bars etc.