2023 Audi S4 Black ED TDI Mhev Quattro A 3.0L Diesel · FD72 OCS

The 2023 Audi S4 Black Edition TDI MHEV Quattro presents with a single DVSA MOT test on record, completed on 9 December 2025, which resulted in a pass with no defects or advisories recorded. While a clean first test is certainly reassuring and indicates the vehicle was presented in sound mechanical condition at the time of examination, the absence of any prior test history limits the ability to establish a longitudinal maintenance trend. A single pass only confirms the vehicle met the minimum roadworthiness standards on one occasion and provides no insight into whether the owner has been proactive with repairs or simply avoided advisory items by timing the test appropriately. For a vehicle of this calibre and specification, a clean MOT is very much expected given its age, so this result is best regarded as confirmation of baseline condition rather than evidence of exceptional upkeep. The recorded mileage of 10,794 miles over an approximate three-year period equates to an annual average of around 3,598 miles, which is substantially below the typical usage profile for a vehicle of this type and considerably lower than the national average. Such low mileage suggests either a predominantly secondary vehicle usage pattern or significant periods of standing between short journeys, both of which carry their own mechanical implications. Extended periods of inactivity can lead to premature ageing of components that degrade through calendar time rather than use, while predominantly short journeys prevent the engine, diesel particulate filter, and exhaust system from reaching and sustaining optimal operating temperature, potentially leading to oil dilution, glazing of the dual-mass flywheel, and incomplete DPF regeneration cycles. Conversely, the relatively modest odometer reading means that traditional high-wear items such as brake pads and discs, clutch, and suspension components are likely to retain substantial service life remaining. Given the low recorded mileage and the vehicle's three-year tenure, particular attention should be directed towards age-related degradation irrespective of the clean MOT outcome. The tyres warrant careful physical inspection for sidewall perishing and cracking, as rubber deteriorates through UV exposure and ozone ingress over time even when tread depth remains legal, and an Audi S4 of this performance specification should be fitted with matching premium tyres of correct load rating. The 12-volt battery, particularly relevant on an MHEV mild-hybrid system where the auxiliary electrical network operates under different demands, should be load-tested as low-mileage vehicles frequently suffer from premature battery failure due to insufficient sustained charging cycles. Diesel fuel systems on low-use vehicles are also susceptible to condensation and microbial contamination within the fuel tank and filter, so inspection of the diesel filter and any water separation components is advisable. Brake calipers, particularly on a quattro drivetrain, can suffer from sluggish operation or binding due to corrosion of the slider mechanisms and guide pins during prolonged standing, and a test drive should include multiple firm brake applications from moderate speed to verify even retardation without pulling, vibration, or shudder. During a physical appraisal and accompanying test drive, the prospective buyer should satisfy themselves that the vehicle has been maintained in accordance with Audi's fixed service schedule, as the low annual mileage can easily result in services being overlooked when the owner judges condition solely on odometer readings rather than elapsed time. Brake fluid should have been renewed on a calendar basis regardless of mileage due to its hygroscopic nature, and the timing belt or chain inspection interval should be verified along with evidence of diesel particulate filter regeneration activity. On the road, listen for any suspension knocks or clonks over uneven surfaces, which would indicate perished or dry-rotted anti-roll bar bushes, control arm bushes, or top mount bearings exacerbated by standing. Pay particular attention to the behaviour of the quattro drivetrain, ensuring smooth engagement and absence of driveline vibration, and verify that the mild-hybrid system functions correctly with seamless start-stop operation. A pre-purchase inspection by a specialist familiar with Audi MHEV diesel powertrains would be highly recommended to verify the integrity of the 48-volt electrical architecture, the condition of the diesel injection system, and the overall state of components that may have suffered from the vehicle's predominantly low-utilisation profile.