Oil consumption at that rate can be a bad turbo charger or a major internal engine issue. The determining diagnostic is not particularly difficult and wold begin with checking the turbocharger air boot or oil. Meridian Automotive (208) 888-3797.
RepairPal Certified shops can diagnose and repair your 2005 Saab 9-3. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.