My Mustangs have been the most reliable vehicles in my family. Here's my list of breakdown/repairs between both my Mustangs. Routine maintainence issues excluded '88 5.0 (owned for 7 years) '03 GT (owned for 3 years) Waterpump on 5.0 let go at 97K miles when pulling into driveway. Cost $40 to fix in less than 2 hours That's it really. 10 years of combined ownership and a $40 waterpump failure is the only time either has let me down. My '03 has never been in for warranty work and when the warranty was about to expire, someone told me to bring it in and have stupid things fixed....except I had nothing to fix at all.