2020 Audi S4 Black Edition TDI Quattro A 3.0L Diesel · PA04 DAL

The 2020 Audi S4 Black Edition TDI Quattro has a flawless MOT history over the past three years, with all tests conducted between October 2023 and October 2025 resulting in a clean pass. This consistent performance indicates a stable maintenance routine, with no recorded defects, advisories, or issues prompting remedial action. The vehicle’s absence of any MOT failures or advisories suggests that the owner has likely adhered to the manufacturer’s service schedule, particularly focusing on critical areas such as the diesel particulate filter (DPF) clearance, turbocharger health, and exhaust emissions compliance. The lack of wear-related advisories or component failures also points to either meticulous upkeep or a vehicle that has not yet reached the critical wear thresholds typical of its age and mileage. The recorded mileage of 21,134 miles for a 2020 model—equivalent to approximately 3,522 miles per year—is notably low for a vehicle of this age and model year, particularly given that the S4 TDI Quattro is a performance-oriented diesel with higher operational demands than a standard petrol or lower-power diesel. Such a low annual mileage could imply either infrequent use, long periods of stationary storage, or a more leisurely driving profile. However, this usage pattern may contribute to specific wear concerns, particularly in components prone to standing corrosion or fluid degradation. For instance, brake systems, particularly the discs and calipers, can develop corrosion or binding if the vehicle has been stationary for extended periods, leading to reduced braking efficiency or uneven wear. Additionally, the 12-volt battery may suffer from reduced charge cycles and potential sulfation if the engine has not been run regularly, necessitating a check for voltage output and overall health. Given the clean MOT history and low mileage, the prospective buyer should conduct a thorough physical inspection to address potential age-related and usage-specific issues. First, examine the tyres for signs of sidewall perishing or cracking, which can occur even with low mileage due to prolonged exposure to UV light and environmental conditions. The vehicle’s age also warrants a check of the coolant system for signs of degradation, such as sludge buildup or leaks, as well as the condition of the brake fluid, which should be replaced every two years or 60,000 miles to prevent gel formation and corrosion of brake components. During a test drive, listen for any unusual noises from the suspension, such as clunks or rattles, which could indicate worn suspension bushes, coil spring failure, or binding strut mounts. Additionally, inspect the exhaust system for corrosion or leaks, particularly around the catalytic converter and muffler, as standing can accelerate rust formation. Finally, verify that the service book is up to date, with stamps confirming adherence to the manufacturer’s recommended intervals for oil changes, turbocharger servicing, and DPF cleaning, if applicable. A check of the engine oil condition—particularly for metallic particles or excessive carbon buildup—would also be prudent, as this can indicate underlying mechanical wear that may not have surfaced in the MOT. If the vehicle has been stationary for extended periods, consider running the engine briefly to ensure the battery holds a charge and that the alternator is functioning correctly.