Preheat oven to 325 degrees F. Grease and flour 2 loaf pans.Combine margarine, oil, bananas,
and sugar. Add eggs, one at a time, beating well.
In a separate bowl, sift flour, salt, and
soda. Add dry ingredients alternately with buttermilk to batter. Mix well.
Stir in nuts and
vanilla.Pour into prepared loaf pans. Bake for 75-80 minutes or until pick inserted in center