Beat the eggs, milk, salt and salad oil together. Stir in the flour.
Heat a little butter or oil in a 6-inch skillet. Pour about 2 tablespoons of the batter into it, tilting the pan to coat the bottom. Use just enough batter to make a very thin pancake. Let the bottom brown, then carefully turn out onto a napkin, browned side up. Make the rest of the pancakes.
Spread 1 heaping tablespoon filling of your choice along one side of the pancake. Turn opposite sides in and roll up like a jelly roll.
You canfry the blintzes in butter or oil or bake them in a 425 degree oven until browned.