Lubricant Is Contaminated
WARNING: This page does not describe the selected car, but rather 58 other vehicles, including the 2003 Saturn Vue, 2003 Saturn L300, 2003 Saturn Ion 3, 2003 Saturn Ion 2, and 2003 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
Drain and flush the axle housing thoroughly. See OVERHAUL in appropriate DIFFERENTIALS article in DRIVELINE/AXLES. Refill with the correct lubricant.