I purchased my Explorer brand new from the dealership. I was contacted for minimal recalls that did not affect the driving performance. The only problem I ever had was a problem with my back window not wanting to roll up or down. It was out of warranty so I had to pay to fix it. During the warranty period I even had my stearing wheel changed because it started to show some worn spots. I think some of the people who complain about cars don't know how to take care of them. If you change your oil and fluids regulary you shouldn't have many problems.
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