This is a well maintained 2015 Jeep GC limited. Lube every 3,000 miles, never overheated, mostly highway miles. Very disappointed that the cylinder head cracked. I understand that Crysler has issued extended warranties to 150k miles to certain vin numbers, but this truck is not one of them. The repair costs half as much as a new engine. In this day and age, there should not be a problem like this. I understand from speaking to the mechanic that this may be a defect.