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:

California Proposition 65 WarningStrut Assembly Removal and Installation
Special Tools
CH 49375 Strut Rod Nut Socket
For equivalent regional tools, refer to Special Tools
Removal Procedure
Remove the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. ...
Oil Pump Replacement
Removal Procedure
Remove the engine front cover. Refer to Engine Front Cover with Oil
Pump Replacement.
Remove the 8 oil pump cover bolts (1).
Remove the oil pump cover (2).
Warning: Before removing the spring, cover the spring with ...
Valve Guide Reaming, and Valve and Seat Grinding
Valve Cleaning Procedure
Use soft bristle wire brush to clean any carbon build-up from the valve
head. DO NOT use a wire brush on any part of the valve stem. The valve stem
is chrome plated to provide enhanced wear characteristics. Wire brushing
the stem could remove the chr ...