Pulled Pork Sandwiches with White Barbecue Sauce

Ingredients

• 2 tablespoons olive oil
• 1 bone-in pork shoulder roast (6 to 7 pounds)
• 1 cup cider vinegar
• 1/2 cup water
• 1/3 cup packed brown sugar
• 4 teaspoons kosher salt
• 1-1/2 teaspoons pepper
• 1 teaspoon onion powder
• 1 teaspoon garlic powder
• 1 teaspoon chili powder
• 1/2 teaspoon paprika
• 1/2 teaspoon cayenne pepper
• WHITE BARBECUE SAUCE:
• 1-1/3 cups mayonnaise
• 1/3 cup cider vinegar
• 1 tablespoon Dijon mustard
• 1 tablespoon Worcestershire sauce
• 2 teaspoons sugar
• 1 teaspoon kosher salt
• TO SERVE:
• 20 potato buns, split