1grease and flour either a 9" X 13" pan or two round 9" pans. I like using the one pan as it just makes every thing easier for me. Pre-heat oven to 350 degrees F.
2Mix cake mix, veg. oil, eggs and mandarin oranges
with electric mixer at low speed until just mixed well.
3Bake about 40 min. depending on your oven, til cake springs back when touched lightly in the middle.
4While your cake is cooling, make the frosting. Empty pineapple into large bowl and add the vanilla pudding.Mix throughly and then add the cool whip and mix well. When cake is completely cooled, frost and then refrigerate.