My 2016 Acadia Denali is burning about 1 quart engine oil every 1,000 miles. Local GM dealer tells us that this is acceptable for this car. But, we can't find any documentation in service/user manuals documenting this. My husband has insisted oil usage be documented and so every 500 miles approx. , I return to the service department to have oil checked and noted. We find this usage unacceptable, but have no recourse at this point. Anyone else experiencing excessive engine oil usage?