2Mix together the cake mix, mandarin oranges, eggs, and oil in a bowl for a couple of minutes until well combined.
3Pour the batter into three 8-inch greased cake pans and bake on center rack for about 20 minutes, until toothpick comes out clean.
4Allow cake layers to completely cool.
5Mix together the cool whip, crushed and drained pineapple, and Jell-O instant pudding with a hand mixer until well combined. Let sit for 1-2 minutes to thicken.
6Frost cake layers and refrigerate for a few hours before serving.