This hexagonal piece attached to a VW engine block is called the Oil Pressure Sensor. It's not an expensive part - http://zyggisautoshop.com charged us $24.62 for the sensor and $1.25 for the seal ring (plus an hour and a half of labor). What's worthy of comment is the fountain of oil you get when the seal fails. Oil mileage roughly equivalent to gas mileage, and boy does it stink!

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