Slow Cooker Michigan Pulled Pork - Pioneer Sugar

Ingredients

• 1 tsp Vegetable oil
• 4 lbs Pork shoulder roast
• 1 cup Barbeque sauce
• ½ cup Apple cider vinegar
• ½ cup Chicken broth
• ½ cup Pioneer Golden Light Brown Sugar, packed
• 1 tbsp Prepared yellow mustard
• 1 tbsp Worcestershire sauce
• 1 tbsp Chili powder
• 1 Extra large onion, chopped
• 2 Large cloves garlic, crushed
• 1 ½ tsp Dried thyme
• 2 tbsp Butter, or as needed
• 8 Hamburger buns, split