2023 Audi A6 S Line 40 TDI Mhev Quat S-A 2.0L Diesel · MM21 AAN

The most recent official DVSA MOT test for this 2023 Audi A6 S Line 40 TDI MHEV quattro S-tronic was conducted on 18 November 2025, at which point the vehicle passed with no defects or advisories recorded against it. While a single clean pass is a positive indicator, it represents only the most recent annual check and does not yet establish a long-term maintenance trend for the vehicle. Given that this is a relatively recent test on a three-year-old car, prospective buyers should interpret the absence of recorded advisories as encouraging but view it cautiously, as the full service and wear history is likely to be found in the Audi main dealer or specialist service book rather than in the MOT record alone. A single pass with no advisories suggests that, at the time of testing, all safety-critical components such as brakes, tyres, suspension, lighting, and emissions were within statutory limits, but it does not guarantee that subsequent degradation has not occurred between November 2025 and the present day. Recorded mileage stands at 22,091 miles over approximately three years of service, equating to around 7,364 miles per year. This annual mileage is broadly typical for a premium executive saloon of this age and is neither excessively low nor notably high. Mechanical implications of this usage pattern are generally favourable, as the vehicle has been driven sufficiently to keep internal components such as the diesel particulate filter, exhaust system, turbocharger, and MHEV hybrid battery active and exercised, while avoiding the heavy wear often associated with high-mileage examples. There are no recorded gaps in mileage progression visible between MOT tests that would suggest prolonged standing, which is important for a vehicle equipped with stop-start technology and a 48-volt mild hybrid system that benefits from regular use to maintain battery conditioning and prevent common issues such as oil seal drying or corrosion setting into braking components from infrequent operation. Given the clean MOT record and moderate mileage, a prospective buyer should focus their pre-purchase inspection on age- and time-related degradation rather than chasing specific recorded advisories. Tyres should be physically inspected for sidewall cracking or perishing caused by age rather than tread wear alone, as Audi factory-fitted tyres on a vehicle of this specification are typically low-profile and can deteriorate from UV exposure even when tread depth remains adequate. The 12-volt auxiliary battery, which is separate from the 48-volt MHEV lithium-ion unit, commonly fails on premium German vehicles between three and five years of age and should be load-tested prior to purchase. Brake discs, particularly on a quattro model that distributes braking force across four wheels, should be checked for signs of corrosion or binding calipers, as standing periods between journeys can lead to judder or uneven braking feel. A thorough test drive should pay particular attention to the S-tronic automatic transmission for smooth changes between ratios and any signs of hesitation or flaring, as well as to the suspension for any knocking over uneven surfaces that might indicate worn bushes or top mounts, even though none were flagged at the most recent MOT. Finally, attention should be given to time-based fluid servicing which does not form part of the MOT assessment but is critical on a modern Audi diesel of this generation. The engine oil, diesel fuel filter, air filter, and crucially the DSG/S-tronic transmission fluid and filter should be verified as having been changed in line with Audi's fixed service schedule rather than purely on the variable long-life interval, as skipping these can lead to premature wear within the mechatronics unit. The diesel particulate filter should be confirmed as having completed recent successful regeneration cycles, particularly if the vehicle has been used predominantly for short urban journeys, although the annual mileage suggests a reasonable mix of usage. Coolant, brake fluid (which absorbs moisture and should ideally be replaced every two years regardless of MOT status), and the AdBlue system should also be checked for correct operation and recent servicing. A pre-purchase inspection by a specialist familiar with Audi MHEV and S-tronic systems, combined with a full diagnostic read using VCDS or ODIS to identify any stored fault codes in the hybrid battery management or transmission control units, would provide the most complete picture of this vehicle's true mechanical condition beyond what the sparse but clean MOT history can reveal.