Heat olive oil in a skillet over medium high heat. Add ground beef and Italian sausage, cooking until browned, about 5-6 minutes, making sure to crumble the beef and sausage as it cooks. The last 2-3 minutes, add onion, carrot and garlic to beef and cook. Drain in a colander to remove excess grease.
Place meat mixture into bottom of slow cooker. Add remaining sauce ingredients and stir to combine. Cover and cook on LOW for 8 hours.
