Here is the factory information that I can give you. There is a ring cleaning procedure that may make little difference. Basically, some oil consumption is normal:
Subject: Information on Engine Oil Consumption Guidelines
Models: 2009 and Prior GM Passenger Cars and Gasoline-Powered Light Duty Trucks Under 8500 LB GVW (Including Saturn)
2009 and Prior HUMMER H2, H3
2009 and Prior Saab 9-7X
This bulletin is being revised to update the warranty information on vehicles and add model years. Please discard Corporate Bulletin Number 01-06-01-011E (Section 06 -- Engine/Propulsion System).
All engines require oil to lubricate and protect the load bearing and internal moving parts from wear including cylinder walls, pistons and piston rings. When a piston moves down its cylinder, a thin film of oil is left on the cylinder wall. During the power stroke, part of this oil layer is consumed in the combustion process. As a result, varying rates of oil consumption are accepted as normal in all engines.
The accepted rate of oil consumption for engines used in the vehicles referenced is 0.946 liter (1 qt) in 3200 km (2000 mi).
Important: This rate only applies to personal use vehicles, under warranty, that are driven in a non-aggressive manner and maintained in accordance with the appropriate maintenance schedule, with less than 58,000 km (36,000 mi), or driven at legal speeds in an unloaded (for trucks) condition.
Important: This rate does not apply to vehicles that are driven in an aggressive manner, at high RPM, high speeds, or in a loaded condition (for trucks). Oil consumption for vehicles driven under these conditions will be more.
Many factors can affect a customer's concern with oil consumption. Driving habits and vehicle maintenance vary from owner to owner. Thoroughly evaluate each case before deciding whether the vehicle in question has abnormal engine oil consumption.
Sunday, June 14th, 2009 AT 11:43 AM