Horrible. I took my MKS to Troy and was initially told it was the timing belt. Later they told me it may not be covered by warranty and that I needed to pay for them to drop my engine to see. I talked to several friends who told me I'd be at the mercy of the dealership if I did that. Friends that use and are very happy at Varsity Lincoln advised I take it there. I did and they told me it was the timing chain, and fixed it. Varsity said it was under warranty. I am a single female, and many male friends feel Troy may have been trying to take advantage of that.