Patent ID: 7299781

Claim:
An engine oil return system comprising: an engine main body including a cylinder head, a cylinder block and an oil pan, the engine main body having a first side surface and a second side surface that is opposite from the first side surface; and an oil return passage including a main oil return passage section and an oil return extension passage section with the main oil return passage section extending along the first side surface of the engine main body and the oil return extension passage section extending from the first side surface of the engine main body towards the second side surface of the engine main body with an oil outlet opening of the oil return extension passage section being disposed at a location adjacent to the second side surface and above a top surface of oil in the oil pan that substantially avoids the oil in the oil pan from being forced up the main oil return passage section due to an acceleration on the engine main body occurring in a direction from the first side surface towards the second side surface.