[archer1965]

check it out, directly from the owners manual. I trust the engineers at Chevy over some dude at at dealership telling you to go race the crap out of your brand new car.

Replaced the rear diff fluid in my car at 600-ish miles. It did have small particles on the magnetic drain plug and some discoloration of the fluid. Good rule of thumb when breaking in a rear diff. I've done it with my Jeep and my Toyota Tacoma after installing a locker.