When BMW introduced the new 5-series F10 in 2010, the 525d still had a 6-cylinder diesel engine. Since 09 / 2011 BMW however replaced this engine with a 4-cylinder diesel engine, the same as in the 520d but then equipped with two turbos and some extra horsepower (520d: 184hp / 525d: 218hp). Also the xDrive all wheel drive became available for the new 525d.
Videos of a 2012 BMW 525d xDrive can be found below:
BMW 525d xDrive Walkaround - Exterior and interior shots of the car
BMW 525d xDrive Fuel Consumption Test - testing the fuel consumption under real life conditions