Double-chamber oil pan and engine with this

Double-chamber oil pan includes an oil pan mounted on the lower engine block, arranged in the oil pan, the second chamber located around the first chamber and the first chamber communicating with the interior of the engine block an oil pan separator to form a, and a, a suction port of the engine oil to be disposed in the first chamber. The first chamber includes a large-capacity portion including a bottom side of the oil pan separator, and a small-capacity portion formed continuously to the upper side of the large-capacity portion.