For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition
65 WarningLubrication Description
Oil is applied under pressure to the crankshaft-(1), connecting rods, balance shaftassembly, camshaft bearing surfaces, valve lash adjusters and timing chain hydraulictensioner. All other moving parts are lubricated by gravity flow or splash. Oil entersthe gerotor type oil pump through a fixed inlet ...