The head gasket may leak oil externally. The oil will be visible around the cylinder head and block area.
Car Problem Reports
Saab 9-3 Head Gasket Leakage
Saab 9-3 Problem
Engines Affected: 2.0L 4 Cylinder Turbo, 2.3L 4 Cylinder Turbo
Average Mileage: 91,500 mi (61,000 mi - 122,000 mi)