Reason for the question: A new 2014 Mustang 5.0 owner is concerned about an engine "tick" that seems to occur AFTER the first oil change. He had an analysis run on the oil that came with the engine and found an unusually high level of boron. Apparently the recommended MC 5w20 doesn't have this high a level of the stuff. I too am concerned since I have the 5.0 with the original oil and am leery of the first oil change effect.
I have never heard of this problem and it doesn't make sense to me.
If there is an engine tick after the first oil change with the recommended MC 5W20, then the owner needs to take the vehicle back to the Ford dealer and complain about any new engine ticking.
Is there a TSB that recommends 5W30 instead of 5W20 in some models of Mustangs?