Well, I did a little research on your photo and I discovered the particular fan in the photo was fitted to European models, optional equipment or not I could'nt say. I don't have a clue as to how the fan and shroud would have appeared from the factory because I have only worked on US models. The thought behind the fan (IMO): Imagine traveling at 200 kmh for 45 minutes to 1 hour, the engine oil is going to get hot. After sustaining high engine speeds for prolonged periods of time and then the vehicle slows down to the speed of inner city traffic the oil may require some extra cooling, hence the added fan. I would suspect that it is controlled by a temperature switch. The switch may be located on the oil filter housing or on one of the oil cooler hoses.