3087259|Piston Ring Set for 2012 BMW 550i xDrive 4.4L - PR881XP15. Replace your original Piston Ring Set with this direct-fit unit for the 2012 BMW 550i xDrive 4.4L. Trusted by mechanics and DIYers alike, it helps maintain optimal engine operation and performance.. 2012 BMW 550i xDrive 4.4L Engine Piston Ring Set - PR881XP15 Also fits the following vehicles: 2010 BMW 550i GT xDrive 4.4L Engine Piston Ring Set, 2011 BMW 550i GT xDrive 4.4L Engine Piston Ring Set, 2012 BMW 550i GT xDrive 4.4L Engine Piston Ring Set, 2010 BMW 550i GT 4.4L Engine Piston Ring Set, 2011 BMW 550i GT 4.4L Engine Piston Ring Set, 2012 BMW 550i GT 4.4L Engine Piston Ring Set, 2011 BMW 550i xDrive 4.4L Engine Piston Ring Set, 2012 BMW 550i xDrive 4.4L Engine Piston Ring Set, 2013 BMW 550i xDrive 4.4L Engine Piston Ring Set, 2011 BMW 550i 4.4L Engine Piston Ring Set, 2012 BMW 550i 4.4L Engine Piston Ring Set, 2013 BMW 550i 4.4L Engine Piston Ring Set, 2010 BMW 750i xDrive 4.4L Engine Piston Ring Set, 2011 BMW 750i xDrive 4.4L Engine Piston Ring Set, 2012 BMW 750i xDrive 4.4L Engine Piston Ring Set