2003–2007 Ford F-250 / F-350 / F-450 (and more): known reliability problem

The problem

6.0L Power Stroke diesel — notorious EGR cooler / oil cooler / head-gasket failures; very costly unless already bulletproofed.

Vehicles affected

Ford — F-250, F-350, F-450, Excursion, model years 2003–2007. Adjacent years and trims with different engines are generally not affected; the exact engine/transmission in the specific car is what matters.

What it means for a buyer

This is a well-documented, expensive failure pattern — the kind that can cost more than the car is worth. Unless the seller can show the failure-prone component was already replaced or repaired under the relevant recall, TSB, or extended warranty, most buyers should simply pick a different car. For context, a Ford averages about $775/year in maintenance and typically retains roughly 53% of its value after five years.

Considering one anyway? Do this

• Ask directly whether the affected component was repaired/replaced, and get the paperwork.
• Get a pre-purchase inspection from an independent mechanic and mention this exact issue.
• Check open recalls by VIN at nhtsa.gov/recalls.
• Pull the free government title history (salvage/flood/odometer) at the NMVTIS portal.
• Price it against unaffected rivals — this issue is negotiating leverage.