Mix flour, sugar, soda, and salt in 2 qt. bowl and set aside. In saucepan, bring oil, oleo, peanut butter, and water to a boil. Pour over dry ingredients. Add eggs, vanilla, and buttermilk. Blend well. Pour into greased or Pam sprayed 12 x 18 pan. Bake at 350 degrees for 15 to 18 minutes. Cool before icing.
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