OP have you experience this slight whining noise when reving the engine while parked or when starting off from a stop? Say shifting from 1-3 and this would happen between 1400 to 2000 rpm?
Eh. Modern factory oils provide the needed protection during break in. There is rarely a benefit to keeping it under 4k rpm. Anyway, load is more important than engine speed.
Then why do you think all these sports car manufacturers spend tons of money breaking in engines gently if it makes no difference?
Like whom?
Like was shown in the video I posted above, Nissan does it for the GT-R, Acura does it for the NSX. Lamborghini does break-in at the factory as well, I’m not sure about the others but I believe they do too.
Those are very expensive, hand built, high tolerance engines. Their specific power output & internal tolerances make the Coyote look like a tractor engine.
My main point is that there’s validity to the gentle break in procedure. And that when manufacturers give recommendations, it might actually still carry some weight. Ford won’t say “don’t go over 4k” because of the safety implications of higher rpms possibly being needed in an emergency. But them saying “don’t drive too fast and change up early” in the owners manual to me sounds pretty against redline runs off the showroom floor.
I work for an automotive manufacturer. Much of what is in the manual was written by lawyers. Ford doesn’t say don’t go over 4k rpm because it isn’t important to break in. As stated before, engine speed means little compared to load. Bogging an engine at 2k will hurt much more than going to 6k.