There could be an oil leak from the oil pressure sending unit. Verify by physical inspection. Replace the sending unit and or the gasket to repair.
Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops
RepairPal Certified shops can diagnose and repair your 2001 Oldsmobile Intrigue. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.