We Ran an Engine on 10-Year-Old Factory Coolant: pH Acidity and Heater Core Corrosion Test
A 2011 Ford F-150 with 140,000 miles arrived for a routine coolant flush. The owner confirmed no coolant had ever been added or changed. The truck had factory green coolant, which Ford specifies for replacement at 50,000 miles or 5 years, whichever comes first. This coolant was 11 years and 90,000 miles past its service […]