Engine with cylinder crankcase and oil return collection channel and oil drain

An internal combustion engine comprising

• a cylinder crankcase;
• a cylinder head;
• multiple cylinders including a first cylinder and a last cylinder;
• at least one oil return collection groove essentially situated in an area of a separation lane of the cylinder crankcase and the cylinder head and extending from the first cylinder to the last cylinder;
• and
• two vertically situated oil drains each in an area of a respective one of the first and last cylinders, the two vertically situated oil drains configured for discharging depressurized oil in a direction of an oil pan, following gravity,
• wherein the at least one oil return collection groove merges the depressurized oil from the individual cylinder areas of the cylinder head, collects the oil and conducts the oil onward to the oil drains in the area of the first cylinders and the last cylinders.