Mix box cake, 1 pistachio pudding, wesson oil, eggs, pecans in a mixing bowl with a mixer.
Spray bunt pan with a flour spray.
Pour cake mix in the bunt pan and bake as directed.
While your cake is cooking make your icing.
Mix Cool whip, milk, pistachio pudding until smooth. Let this sit in the refrig until your cake has cooked and completly cooled.
After your cake has cooled icing your cake and enjoy!