The invention relates to an internal combustion engine (1) comprising a cylinder crankcase (2) and a cylinder head (3) that comprises an integrated exhaust manifold (4), wherein the cylinder crankcase (2), the cylinder head (3) and the integrated exhaust manifold (4) have a continuous water cooling jacket (12) that forms part of a coolant circuit (6) of the internal combustion engine (1). In order to ensure during shut-down cooling and/or warm-up cooling of the exhaust manifold (4) that a majority of the coolant that is fed into the water cooling jacket (12) reaches the exhaust manifold (4), while only a small portion of the coolant flows around the cylinder through the cylinder crankcase (2), according to the invention the coolant circuit (6) comprises a collector (27) that communicates via though-openings (38) having reduced opening cross-sections with the water cooling jacket (12), and coolant channels (39) arranged in extension of a flow direction through the through-openings (38) lead to the exhaust manifold (4), while coolant channels (32) branching off laterally behind the through-openings (38) lead to the cylinder crankcase (2).