I have a 2019 Silverado LTZ - about 6 weeks old. Mine is right there with ShamrockShooter. 10% for every 1000 miles (front); about 5% rear. Front would be out at 10K miles. I'm at 5,200 now; took it in for first oil change today and asked. They said "they're supposed to be working on a fix" but didn't offer any solution at this time.