The valve protects the valvetrain of the engine from dirt outside the environment while keeping the oil inside the engine. The valve cover gasket seals the cover to the rest of the engine to keep the oil from escaping the head and pressure inside the engine. Leaks on the valve cover is critical and can result to overheating or complete engine failure if neglected and not looked after immediately. If you are experiencing a burning smell near the engine, seeing visible oil leaks on the valve cover, engine is always low on oil or running rough and misfiring then you may have to replace your valve cover with gasket. The Valve cover and gasket can easily be located inside the engine bay and can be accessed by removing the engine cover, the coils and a few bolts and requires no special tools. Fits the Following Vehicles with N51/N52 Engine: 2008-2013 128i 3.0L 2007-2011 323i 2.5L 2007-2013 328i 3.0L 2007-2008 328xi 3.0L 2006-2007 525xi 3.0L 2008-2011 528i 3.0L 2009-2010 528i xDrive 3.0L 2008 528xi 3.0L 2007 530i 3.0L 2006-2007 530xi 3.0L 2007-2011 X3 2.5L 2007-2012 X3 3.0L 2007-2010 X5 3.0L 2007-2011 Z4 2.5L, 3.0L Replacement part number: 11127552281, 11-12-7-552-281, 264-935 This is a compatible replacement part manufactured by AA Ignition. This valve cover with gasket is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this valve cover with gasket fits.