Sift together the dry ingredients into a large bowl and make three "wells." Pour the oil into one well, the vinegar into another, and the vanilla into the last. Pour the warm water over everything and beat with a spoon until the batter is smooth.
Bake in a pre-heated oven in an ungreased 9x13 pan for 30-35 minutes. Oven temperature is 350 for a metal pan or 325 for a glass pan. When the cake is cooled, frost with whipped cream or your favorite fluffy frosting.