I used to go to Chevy for service and was seeing the same issue and got frustrated.  Starting going to Meineke and they found out that I had an ongoing oil consumption issue.  I contacted Chevy and GM.  They said the vehicle had too much mileage and I tried to explain the issue.  I went back to the Chevy dealership and they didn’t find an oil consumption issue.  There was a major lawsuit in other states regarding this as well.  I didn’t have all these issues brought to my attention until I went to Meineke and performed my own research.