An internal combustion engine has an engine block including a crankshaft which is mounted on the engine block by at least a first and a second main bearings, wherein the main bearings each include a first bearing portion and a second bearing portion, the second bearing portion being part of a bearing cap, wherein at least the first bearing cap is connected to the engine block or to the second bearing cap by at least one dampening structure, the structure including a first support portion fixed on the bearing cap, a second support portion fixed on the engine block or on an adjacent bearing cap, and a dampening portion including an elastomeric material which connects the two support portions.