has any one heard of 6.4L engins blowing up
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^^^ This is also a good point.
The first engine I changed had about 8000mi on it, and the second one had about 5-6000mi on it, but WELL over 5500 hours. 1 hr = approx 35mi in warranty's eyes, so that motor had 187,000MI of idle time on it
"Unfortunately, this engine is no longer eligible for Ford Motor Company's DIESEL ENGINE WARRANTY. We apologize for any inconvenience that this may cause."