My buddy just spent three days with me down here in socal because the Vegas Chevy dealers won't give him the time of day. His truck has been throwing metal shavings into the oil for months and is not just burning oil, but also it's destroyed the rear main. GM 's new rules are to drive it for a thousand miles including across the desert so they can preform a oil loss/burn analysis. If the oil light turns on stop the vehicle and get a tow (at your expense) and bring it in.
PS the truck has 48 k on it and has had problems for the last 10 k. They still won't lemon it.... Fuck GM these days.