I read somewhere that they are expected to last the 'lifetime of the car' and that lifetime was deemed to be 180k miles. Of course it depends on how those miles are driven. Mine where all replaced on warentee at 23k miles but have done another 100k+ since then and still well within specs..... I let you know in another 80k miles how they are holding up.
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2012 A6 3.0 TDI Avant, Silver, 7 Spd STronic, Bose, ACC, Advanced Parking Camera, Power close / open tailgate, Side and Lane Assist, AMI & Jukebox, Adaptive lights with corner and high beam assist, Through load with ski bag, Audi pre sense plus, sports diff and sport suspension, Panoramic roof, Storage pack, MMI touchpad and VIM, etc. Oh and now retro fit rear seat entertainment 
2019 BMW I3. Heat pump, Winter, professional and comfort packs, Harmon Kardon, autopilot
2022 Mercedes EQC 400
Previously: 2009 S8, Silver, B&O, Ceramic Brakes, Advanced Parking Camera, VCDS
2008 A8 3.0 Tdi sport, B&O
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