Valve Cover Leak?

[CraigH78]

Hey All,

Took my 2018 3500 6.7 Dually to my brother shop for its first oil change, 13k miles and when we got under it, there's all kinds of oil on the rear of the motor.

For a second we though rear main but as we looked closer the top of the trans is black with oil, it's running down the sides as well.

Followed it up and looks like the back passenger side of the rocker cover is leaking.

Will that leak enough to make it look worse at the bottom? Of course about to pull the 5th wheel on a 1600 mile round trip in 2 days.

Thoughts?

There's never been a drop in the driveway and I've got a brand new concrete driveway so its pure white so I'd see it.

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