Oil pan mounting structure

A mounting structure for an oil pan including an outer pan made from a metal and an inner pan made from a synthetic resin and fixed to an underside of an engine by bolts, the outer pan having an upper opening edge, the engine having an underside with an opening edge, the mounting structure comprising:

• abutments provided on outer peripheral portions of the opening edges of the outer pan and the engine so as to abut against each other, respectively;
• bolt holes formed through the outer peripheral portions of the opening edges so that the bolts are inserted through the holes respectively;
• an accommodation space defined between inner peripheral portions of the opening edges of the outer pan and the engine by collapsing the inner peripheral portion of the opening edge of either outer pan or engine;
• and
• a flange protruding sideways from the inner pan and loosely fitted in the accommodation space.