WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Crankshaft Front Oil Seal
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
Do not damage the seal bore or the contact surfaces.
Use a screwdriver to pry out the crankshaft front oil seal.