2020 Audi S4 TDI Quattro Auto 3.0L Diesel · RS59 TAZ

The 2020 Audi S4 TDI Quattro presents a stable and improving mechanical trajectory, culminating in a completely clean MOT test on 2 March 2026 at 23,158 miles with zero defects recorded. This latest pass resolves a recurring tyre degradation issue that plagued the vehicle in previous years. The maintenance trend has shifted from a period of neglecting rubber components to a well-maintained state, indicating the previous owner addressed the underlying causes of the premature wear. Covering just 23,158 miles over six years equates to roughly 3,860 miles annually, confirming exceptionally light usage. The mileage accumulation reveals a brief pause in the typical 12-month testing cycle between March 2023 at 13,297 miles and February 2025 at 20,592 miles, during which the vehicle covered 7,295 miles. The subsequent year saw minimal use, adding only 2,566 miles by March 2026. Such low mileage suggests prolonged periods of standing, which historically caused the tyre sidewall cracking and perishing noted in 2023 and 2024. Despite the clean 2026 certificate, a physical inspection must focus on the suspension bushes, coil springs, and brake components. Extended stationary periods frequently cause rubber suspension bushes to perish and brake discs to surface corrode, issues MOT tests often miss unless severely degraded. The historical tyre advisories point to either aggressive wheel alignment or prolonged standing; a buyer must verify the current tyre date codes and check for uneven inner wear. Inspect the exhaust system for corrosion and assess the structural integrity of the undercarriage, as low-mileage diesel quattros sometimes suffer from DPF clogging or short-trip inefficiencies that MOT emissions tests do not fully capture over a single cycle.