Best "Blue Ribbon" Apple Pie

Ingredients

• 2 ½ cup all-purpose flour
• 1 tbsp sugar
• 1 tsp salt
• 3 tbsp vegetable oil
• 1 cup cool unsalted butter, cut into pieces (does not have to be ice cold)
• ¼ cup cool water
• 2 tsp white vinegar or lemon juice
• 6 cups peeled and sliced mixed apples (such as Mutsu, Granny Smith, Royal Gala, Honey Crisp, Cortland or others) - about 5 medium apples
• 1 tbsp fresh lemon juice
• ½ cup granulated sugar
• ⅓ cup packed light brown sugar
• 1 tsp ground cinnamon
• ¼ tsp ground allspice
• ¼ tsp ground nutmeg
• 2 tbsp rolled oats
• 1 recipe Double Crust Fruit Pie Dough
• 2 tbsp unsalted butter
• 1 egg mixed with 2 Tbsp water, for brushing
• sugar and cinnamon, for sprinkling