Compatibility: 2006-2010 BMW 550i 4.8L 2006-2010 BMW 650i 4.8L 2006-2008 BMW 750i 4.8L 2006-2008 BMW 750Li 4.8L 2007-2008 BMW 760Li 6.0L 2011 Mercedes-Benz ML450 3.5L 2007-2015 Rolls-Royce Phantom 6.7L Benefits: 1.Dual Insulated Protective Cover Prevents premature zirconium sensor wear 2.Laser welded sensor body to keep out contaminants 3.Internal Ceramic Insulation for optimal sensor performance. 4.Sealed wire leads prevent moisture interference with electronic signal Q&A: Q1:Why the oxygen sensor important for your vhiche? .