Preheat oven to 350 degrees. Grease and flour a 9-by-5-inch pan.
Combine and set aside the flour, baking soda, sugar and salt.
In a large bowl of a mixer combine the bananas, vegetable oil, vanilla, buttermilk and eggs. Add dry ingrediants and mix until well combined. If adding nuts, do so now. Bake 1 hour and 15 minutes until loaf is golden brown and split open.