Luscious Cake

1 box lemon or yellow cake mix
1 can mandarin oranges with juice
4 eggs
1/2 c. vegetable oil
1 (8 oz.) container Cool Whip
1 can crushed pineapple with juice
2 boxes instant vanilla pudding

Mix first four ingredients and put in two flat pans. Bake at 350 degrees. Cool. For topping mix rest of ingredients and put on cakes. Keep refrigerated.