An oil collection system includes a boat that has an engine. A pan is removably coupled to the engine such that the pan may capture oil leaked from the engine. A plurality of clips is provided and each of the clips is coupled to the pan. Each of the clips engages the bottom end of the engine such that the pan is removably retained on the engine. A filter is positioned within the pan such that the filter filters the oil. A gauge is coupled to the pan such that the gauge may display an amount of oil contained within the pan. A drain is coupled to the pan such that the drain may selectively drain the oil from the pan.

A variable compression ratio internal combustion engine is equipped with a variable compression ratio mechanism that changes an engine compression ratio depending on the rotational position of a first control shaft arranged in an oil pan, and an actuator that changes and holds the rotational position of the first control shaft, and a linking mechanism configured to link the actuator and the first control shaft. The linking mechanism has a lever linked to the first control shaft, and a connecting pin configured to rotatably link the tip of an arm part extending radially outward from the center of the first control shaft and one end of the lever. At least when having been set to the highest compression ratio, the first connecting pin is configured to be submerged below an oil level of the oil pan.

An oil collection system includes a boat that has an engine. A pan is removably coupled to the engine such that the pan may capture oil leaked from the engine. A plurality of clips is provided and each of the clips is coupled to the pan. Each of the clips engages the bottom end of the engine such that the pan is removably retained on the engine. A filter is positioned within the pan such that the filter filters the oil. A gauge is coupled to the pan such that the gauge may display an amount of oil contained within the pan. A drain is coupled to the pan such that the drain may selectively drain the oil from the pan.

An engine comprising: a crankcase having an opening at a lower portion thereof; and an oil pan connected to a lower portion of the crankcase so as to close the opening, wherein the crankcase includes a reinforcing plate portion integrally formed with the crankcase so as to span the opening.