2003 Audi RS6 4.2L Petrol · LS53 OKP

The most recent MOT test on 30 July 2026 resulted in a pass, although the vehicle was also subjected to a failed test on the same date, suggesting the failure items were rectified and re-presented within the same inspection window. The pass carried five advisories, all centred on the front braking system: front brake disc wear (described as not excessive), slight corrosion to the ferrules of both front brake hoses, and corrosion to both front brake pipes, which were noted as being covered in grease or other material. Notably, these advisories mirror the items recorded on the same day's failed test entry, confirming the rectification work addressed the underlying failures rather than simply clearing the advisories. Looking at the broader MOT history, the maintenance trend appears broadly stable but with a recurring and worsening theme around front brake pipe and hose corrosion, alongside persistent minor oil leaks noted consistently since 2023. The brake pipe corrosion has progressed over the four-year MOT history visible here, culminating in major defects at the 2022 test and recurring advisory-level corrosion subsequently, indicating that although the immediate safety risk has been managed, the underlying corrosion issue has not been comprehensively resolved. With a recorded mileage of 101,587 miles over approximately 23 years, the vehicle averages around 4,417 miles per year, which is notably low for a high-performance Audi RS6. This low annual usage pattern suggests either extended periods of standing or predominantly low-mileage driving, both of which carry distinct mechanical consequences. Long periods of standing can accelerate corrosion on ferrous components, dry out rubber seals and boots, degrade brake fluid through moisture absorption, and discharge the 12V battery through parasitic drain. Conversely, low-mileage running does not necessarily prevent wear on high-stress components such as the dual-clutch gearbox, quattro drivetrain, and turbocharger oil seals, which can suffer oil starvation and internal glazing if not regularly brought up to full operating temperature. The consistent minor oil leak advisories since 2023 may be indicative of age-related seal degradation typical of the 4.2-litre twin-turbo V8, which warrants close inspection. Given the recurring advisories relating to front brake disc wear, brake hose ferrule corrosion, and brake pipe corrosion, a prospective buyer should prioritise a thorough inspection of the entire braking system. On a test drive, listen for any metallic grinding or squealing from the front brakes, feel for brake shudder through the pedal or steering wheel under firm application, and check that the vehicle pulls up squarely without pulling to either side, which could indicate a binding caliper or uneven pad wear. The front brake discs should be physically measured for minimum thickness against the manufacturer's specification, and the flexible hoses and metal pipes along the chassis should be examined for any signs of active corrosion, weeping fluid, or recent repair patches that may be concealing further deterioration behind. The advisories from 2025 relating to perishing rear tyres and a binding rear service brake also merit attention, as binding calipers often result from seized slider pins or corroded piston bores, common on vehicles that see infrequent use. Beyond the documented MOT items, the age and low mileage profile of this 23-year-old RS6 demands several time-based inspections that would not necessarily be flagged on an MOT test. Tyre sidewalls should be carefully checked for cracking or perishing, as the 2025 advisory noted rear tyre deterioration, and age-related rubber degradation can affect tyres well before the tread depth limit is reached. The 12V battery should be load-tested, as batteries over six years old commonly fail without warning, particularly on vehicles standing for extended periods. Brake fluid should be assumed overdue for replacement regardless of the MOT result, as it hygroscopically absorbs moisture over time and should be changed at least biennially for spirited driving use. Coolant, power steering fluid, and the V10 engine oil should all be verified as recently serviced, and the timing chain and turbocharger actuator wear should be assessed by a specialist familiar with the RS6 platform, as these are known age-related concerns. Finally, verify the authenticity of the service book stamps and request evidence of cambelt or timing chain service intervals, as neglect in this area on a hand-built performance V8 can result in catastrophic engine damage.