I am about to sell my 2007 Kia Sportage and I decided to take the car to a mechanic to get a knocking sound checked out. The mechanic told me that the sway bar links and bushings needed to be replaced and because of where they on located in the car, it would be a four hour repair. He quoted me $685 for this repair, which seems incredibly steep. A second mechanic quoted me around $500, better but still expensive.
Is this a repair that I should do before I sell the car? If I should do it, do these quotes seem fair?
Finally, the car has 80,500 miles on it. The first mechanic said that I needed new spark plugs while the second one said I shouldn’t need it until 90k. Any thoughts?