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Case Study: 2017 Audi S6 Rear Differential Failure Recently, we encountered a costly repair with a 2017 Audi S6. The vehicle suffered from a rear differential breakdown, leading to severe metal grinding noises and limited mobility. Despite Audi's claims of "Lifetime fluid" that supposedly never needs changing, our findings suggest otherwise. 🔧 Breakdown Details: Symptom: Audible grinding/scratching noise from the rear. Diagnosis: Rear differential failure, with no visible damage to drivetrain components. The noise was traced back to the differential assembly. Repair Challenge: Audi provides no repair parts for the differential. The only solution was replacing the entire unit, costing the client $13,785 and a three-week wait for delivery from Germany. 📸 Inside Look: We disassembled the old unit and discovered a blown bearing and significant wear indicated by metal shavings—clear signs of inadequate fluid maintenance. 💡 Takeaway: This incident underscores the importance of regular fluid service, regardless of manufacturer recommendations. The failure occurred at just 90,000 km, shortly after the powertrain warranty expired. 🛠 Advice: Don't wait for a breakdown! Regular checks and maintenance can save you from unexpected and expensive repairs. Let’s keep your ride smooth and sound! For all your auto repair need in Burnaby BC, get in touch with the Garage today.