I have the same as you and gabriel in my Impala. It's been rock solid since the day I got it. It came with dealer oil changes and I was chasing a tire issue when I first got the car, so I had the dealer change it. It's an omnivore, doesn't appear to be sensitive at all to brands or formulation. I'm on to QSUD that I bought on sale at Menards now. Before it was whatever the dealer used (the sticker said Mobil 1, but it could really be anything). I also did a run with Napa Synthetic in there too. No difference as far as I could tell. Never burned any noticeable quantity of oil either.
This is my first DI engine as well, and I have 26K on it as of today. I make sure to "blow it's nose" every once and a while getting on a freeway to try to keep the valves as clean as possible. I was glad to see GM go back to a regular old spin-on filter for these engines. The cartridge design started off OK, but as they added more and more stuff, it became a gymnastics stunt to get the thing out of there. Now that it is back on the front, getting too it is a cake walk other than the rocket hot catalyst nearby. I usually break it loose while everything is hot and wait for a few while the skin of the catalyst cools off.
