I have a 2013 Base Cayenne with the 3.6 engine. I had the oil changed and new spark plugs and igniters at 180,000 miles. During the installation, the valve gasket was found to be leaking and was replaced with new oil separator. Now the car is using oil at the rate of one quart every two thousand miles. I went on a 4500 mile road trip and got three minimum oil level alerts. Any ideas? No drips or smoke.

The dealer is doing a leak down test.

Thanks