I will go along with that. But that leads to another question, will a 2 to 4 degree stretch effect performance enough to warrant fooling with a key replacement. or should I not be to concerned with it. My biggest fear is that I would have a chain failure, then a major engine repair on my hands. Although I have no other vehicle to compare with, the car seems to run well. Thanks for any replies.

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Keith Schuster
2006 E350 98K miles
2013 Ford Explorer 15K miles