Wet ingredients: In a large mixing bowl, whisk together the eggs, sugar, oil, and vanilla extract. Add half of the milk and whisk together until combined.
Dry ingredients: Add the flour and salt and whisk until almost combined. Add the rest of the milk and continue whisking until you have a very fluid batter with some small lumps.
Strain: Push the batter through a fine mesh sieve into another large bowl to break up the lumps for a smooth, watery batter.
Heat pan: On a stovetop, preheat a pan on medium heat. Add a small amount of cooking oil and wipe away the excess with a paper towel to leave only a thin film of oil on the pan. The pan is ready to use when a drop of water in the pan sizzles away immediately.
Tilt pan: Use a ¼ cup measuring cup or ladle to add the batter to the middle of the pan. Immediately tilt the pan around to allow the batter to coat the bottom of the pan. Replace the pan on the stove when the batter stops running.
Cook: Cook the crepe for about 90 seconds on one side or until the edges start to lightly brown and lift from the pan. Gently flip the crepe with a spatula. Cook for another 30-60 seconds on the other side. Transfer the crepe to a cutting board to cool laying flat. Repeat with the rest of the batter. You should end up with about 22-24 crepes.
Filling
Whip cream: In a large mixing bowl, add whipping cream, powdered sugar, and vanilla extract. Use a hand mixer fitted with a whisk attachment on medium speed to beat the cream until it becomes firm peaks.
Assemble the cake
Organize: Before you begin, separate your crepes into three even stacks.
Alternate crepes and cream: On a cake turntable (optional), lay down the first crepe. Spread an even layer of whipped cream on top of the crepe, leaving about ¼" of the outer edge empty. Place another crepe on top and repeat until you've finished the first stack of crepes.
Mango layers: On the last layer of the stack, spread an even layer of whipped cream on top. Arrange an even layer of mango slices on top of the cream. Spread a bit more whipped cream on top of the mangoes to seal. Continue with the next stack of crepes and repeat.
Topping: Transfer the remaining whipped cream to a piping bag fitted with a piping tip of your choice. Pipe a ring of whipped cream on top of the cake. Fill the middle of the ring with chopped mangoes.
Chill: Chill the crepe cake in the fridge for at least 1 hour to let the whipped cream set and prevent the layers from sliding around when you slice into it.