Internal combustion engine

An internal combustion engine, comprising:

• a cylinder crankcase delimiting a crank chamber and a lubricant pan accommodating a lubricant sump;
• a lubricant pan upper part arranged between the crank chamber and the lubricant sump;
• a lubricant pan lower part fastened on the lubricant pan upper part;
• a plurality of ridges originating from a base component of the lubricant pan upper part, and extending in the direction of the lubricant sump, certain ridges of the plurality of ridges partially intersecting certain other ridges of the plurality of ridges, thereby forming chambers which are peripherally closed in section between intersecting ridges;
• and
• lubricant passage openings formed in the lubricant pan upper part and opening into at least part of the chambers, the crank chamber and the lubricant sump being fluidically connected via the lubricant passage openings;
• wherein, in at least one of the chambers, into which none of the lubricant passage openings open, at least one ventilation opening opens;
• and
• wherein the at least one ventilation opening additionally fluidically connects the crank chamber and the lubricant sump and has a smaller through-flow cross section in comparison to the lubricant passage openings.