Never seen this as a problem.

Someone cracked it. The only time I've seen this was an oil change place
broke it when they cranked the car up with a funnel in this hole.

I hope you comprehend what replacing this involves.

Well we determined that the damaged cam/valve cover  must have been caused by the place I had $989.34 worth or work done on it.
Part of that work was a simple $20 oil change.

They must have left the filler gun with the foot long rubber tube with the 1.5 inch metal end on it in the oil filler hole when they
cranked
the engine over and the Cam caught it and pushed it into the cam valve cover.  It split out.
Another possible cause could be they tried to top it off with the engine going.

There is nothing else in there that would have caused it.  A small nut or something could not have caused that damage.
There was not enough mass in a nut to split a 3/16 inch cast cover like that. I has about a 5+ inch irregular crack.  Kind of
a upside-down U shaped crack with a handle on it.  The U shape was about 3+ inches long.

The shop may not have known it happened as the mechanic was probably the one cranking the engine over.

I even looked at the engine bay and removed the oil cap when I picked it up and did not notice it.
5 days later I opened the hood and oil was all over the cover, plenum cover and belt covers and hood.  I wiped it up and looked
and did not see where it was coming from.  My son drove it 5 miles and then looked and it had leaked again.
He was able to see the crack on the side of the cover at that time.  So it was easy to miss. I do not blame the
mechanic for not seeing it.

Well the shop would NOT admit to causing it and offered to fix it for 1/2 the labor and I pay all parts.  That would have been about
$120 parts (not including a new cam cover) and 7 hours labor  so 3.5 hour labor or a total of about $500+ to me.  For their mistake!

They also said they did not do internal engine repair so if they got it apart and there was an issue with the cam or other
it would have to go somewhere else.

I took it to a Z shop and they fixed it for $566 including the $120 "new customer" and "I feel bad for you" discount.  Thankfully
there are some shops that are still trustworthy.  They even took pictures and video of it.

I am going to go back to the original shop and give them one more chance to pay for the repairs.  If that does not work I will go up
the chain to corporate as it is a liability issue not really a warrantee issue according to the corporate warrantee advisor at the
1-800 number.

Keep you posted.