In a small bowl, combine the oil, dressing mix, garlic salt and cayenne. Divide pretzels between 2 ungreased 15x10x1-in. baking pans. Pour oil mixture over pretzels; stir to coat. , Bake at 200° for 1-1/4 to 1-1/2 hours or until golden brown, stirring occasionally. Cool completely. Store in an airtight container.