Okay I have a 2024 silverado 6.6 l8t gasser. Have been running Mobil 1 Extended Performance 5w30. 5k oil changes. After about 3000 to 3500 miles i have noticed 1/3 to 1/2 quart oil usage. I have seen some guys on truck forums say they switched to Pennzoil platinum 5w30 and their oil usage pretty much stopped or almost stopped. Any opinions on why this could happen? Would it be okay to switch over to Pennzoil when I change at 20k?