Dear:
I have damage to the cam shaft of three 6.7 power stroke engines. The engines have always been lubricated with motorcarft oil 5w40 100% synthetic and changes oil and filter every 8,000 miles. One with only 110,000 miles. I searched the web in different chat and there is no reference to similar damages. I do not know if you know something and what is the cause of this damage.
regards