Seperate the eggs. Using a mixer, whip the egg whites until soft peaks form. Place in seperate bowl.
In medium bowl, combine 1 1/4 cup sugar and melted butter. Add vegetable oil, buttermilk and vanilla and mix.
Place flour, baking powder, baking soda and salt in bowl of mixer fitted with paddle attachment.
With mixer on low pour buttermilk mixture into flour mixture. When combined, turn to medium speed and mix for 2-3 minutes untill smooth and light.
Add whipped egg whites and blend on low speed just until mixed. Do not overmix.