1 box Duncan Hines butter cake mix
1 (11 oz.) can mandarin oranges and juice
1 1/2 c. oil
4 eggs
1 (12 oz.) carton Cool Whip
1 (15 1/2 oz.) can crushed pineapple
1 (3 1/2 oz.) vanilla pudding

Mix together first 4 ingredients. Bake at 350 degrees for 25 minutes in 3 round pans. Let cool and frost. Mix and fold in last 3 ingredients.