I remember a few years ago, 2002-ish, 146K miles at the time. we had a 1989 Cougar 3.8L, and from 2002-2005, the oil was not changed, and the filter started to leak.. It went maybe around 20K miles a year. This car lasted 197K miles, BUT it did die because of all the rust, The floor, trunk, rockers, all gone. This engine also burned oil, So It would not even be checked, and we would go by engine sound, after a 5K miles, we would need to add 2 QTS...