Car is a company lease with 58,000 miles. Subtle leak. Only noticed after I was adding windshield wiper fluid and saw that the coolant reservoir was below minimum. Seems like this would be covered under manufacturer's warranty. If this was a ten year old car, I could probably agree that the plastic was aged but this is too soon and is probably a defect in manufacturing. Last complaint - Ford uses a proprietary coolant and it is very expensive to top off.