Cut each chicken wing in half at the joint. In a large bowl, combine the oil, green onions, soy sauce, 2 tablespoons garlic, ginger and 1/4 teaspoon red pepper. Add the chicken wings and turn to coat. Cover and refrigerate 2 hours.
Preheat the oven to 400°F. Using tongs, transfer the chicken wings to a large baking sheet. Bake until cooked through and golden brown, about 20 minutes.
Meanwhile, in a medium saucepan, combine the vinegar, sugar, water, chili garlic sauce, remaining 1/2 tablespoon garlic and remaining 1/2 teaspoon crushed red pepper. Bring to a boil; reduce heat and simmer until the glaze mixture thickens to a syrup consistency, about 40 minutes.
Transfer the baked chicken wings to a large bowl. Pour the glaze over; toss to coat. Transfer the chicken wings to a platter. Sprinkle with green onions.