GavinL6.6

Hello, I have a 2024 chevy 2500 HD with the gas 6.6L l8t and it is having oil consumption issues, I was down in Tennessee not hauling anything completely empty (originally from Wisconsin) and the "oil low add oil" warning came on, thankfully I was at a hotel and had a buddy with me so we went and got oil and I changed the oil in the hotel parking lot, this was at roughly 27k to 28k miles, I thought nothing of it as I was past my usual oil change interval and just assumed I took too long to change it, I usually change it at around every 5k miles and the last oil change was at 20k. But then at 30791 the "low oil add oil" light came on again, so I checked the dip stick and sure enough its bone dry, I slowly added oil until it was at the full level on the dip stick and it took roughly 3 quarts to get it to full on the stick. It's under warranty but dealer isn't taking it very seriously, they just want to change my oil and see if it happens again, I have used mobil 1 full synthetic 5w-30 for every oil change and had no issues and now all of a sudden it has issues, I have thought maybe the pcv valve has gone bad but can't find anything on the internet about it or where it even is or if this truck even has one, any input would be greatly appreciated