[Idaho2018GTPremium]

There's some GM track documents that indicate to change the oil at 500 miles and to change the rear diff fluid before track use. I changed my oil for the first time at 1000 miles and considered that the end of my break-in period. I didn't baby it during break in, but I never got close to redline. I definitely gave it some good runs to 4000 rpm, and a few times accidentally hit 4500-4700ish rpms, but only very briefly. I changed the oil again at ~4,600 miles (earlier than needed) and also had the rear diff fluid changed with the OEM ACDelco fluid. The service tech said it was sliver-ish. Highly recommend a similar fluid change schedule, or even better, change the rear diff fluid at 1,000 miles with the first oil change.