Unless GM didn't want to waste the oil. This also gives the customer the impression they are getting a special service for their special car. They are trying to build value from a mistake.
Just so you know, it IS the case. I own a C7. I am also in the car business, if you know what I mean. ;-)
It's only for the dry sump Z51 and Z06, not the wet sump C7. The truck is a wet sump so don't worry about it.
A lot of the dry sump cars were coming overfilled from the factory and the manual stated the wrong oil fill amount and they were puking oil into the intake tube and getting all in the intake manifold and leaking onto people's garage floors and driveways through the airbox so the early oil change is basically a way for them to correct any potential fill level issues, NOT because of break in as stated.
Again, this has ZERO to do with trucks.
the Z51 has a dry sump but the non Z51 has a wet sump just like the truck.
intake manifold is different and exhaust system is different (of course - car vs truck, Ypipe vs Xpipe).
truck makes 40 less HP when stock.
my mod list:
2" Level
Method NV wheels
Toyo AT2 Tires
Air Raid MIT/Filter
Kooks Long Tubes
Magnaflow Catback on the way
E85 Fuel (Custom Tuned by me)
Black Bow Ties
pioneer sub/amp
My stock wheels were 18s with crappy tires, which I ordered because I knew they were getting replaced.
the ride is different, the tires are stiffer, i run 45 psi in them, and it is almost like adding bigger front and rear sway bars, it doesn't roll over as much. it feels much more controlled. i would not say it feels uncomfortable at all. it feels better.