2006 Mercedes CLS 3.0L Diesel · BJ04 JAM

The most recent MOT test on this 2006 Mercedes CLS was conducted on 24 April 2026 and resulted in a pass, with a single advisory recorded for an oil leak deemed not excessive. Reviewing the trajectory of recent tests, the vehicle passed in 2023, 2025, and 2026, with a failed attempt occurring in February 2024. That failure involved several major defects relating to windscreen wiper effectiveness, severely reduced headlamp light intensity, and excessive blue smoke from the exhaust both at idle and under acceleration. These were subsequently rectified, allowing the vehicle to pass later in February 2024 and to continue passing in subsequent years. The maintenance trend is therefore broadly stable, though the recurring advisory for an oil leak, noted at every test from 2023 onwards, suggests a persistent minor fluid loss that warrants ongoing monitoring. Recorded mileage stands at 106,642 miles, which against the vehicle's approximately twenty year age equates to an annual average of around 5,332 miles. This is considerably below typical usage for a car of this vintage, indicating either a long-standing ownership pattern of light use or extended periods of inactivity. Such low annual mileage reduces wear on major drivetrain components such as the engine, transmission, and clutch, but it conversely raises the likelihood of age-related degradation, including standing corrosion on brake discs, seized or binding brake calipers, dried and cracked rubber components, and potential flat spots or sidewall perishing on tyres that may have been fitted for some years. Given the persistent advisory for an oil leak recorded across the last four MOT tests, a prospective buyer should conduct a thorough physical examination beneath the engine bay and underneath the vehicle, ideally on a lift, looking for wet oil residue on the sump, valve cover gasket, timing cover, and turbocharger or oil cooler pipes if applicable. On a test drive, listen for any change in engine note suggesting worn valve stem seals, as blue smoke previously recorded on acceleration is often symptomatic of this wear. Smell for burning oil, and monitor oil level via the dipstick before and after a long run to quantify any loss. The steering rack inner joint play advisory from February 2024 should also be checked; on test, listen for clunks or knocking from the front suspension over bumps, and inspect for uneven inner tyre wear which can be indicative of deteriorated suspension components. Beyond the recorded advisories, the low annual mileage warrants attention to several age-related items. Brake discs may exhibit surface corrosion from standing, particularly evident as a judder through the brake pedal on the first application from cold, while calipers may bind, causing the vehicle to pull to one side or exhibit uneven brake pad wear. Inspect all four tyres closely for cracking, perishing, or crazing on the sidewalls, even if tread depth appears adequate, as rubber degrades with age regardless of mileage. Verify the date code on the battery and ensure the 12V unit has not expired, as battery life on lightly used vehicles is often shorter due to infrequent full charging cycles. Confirm brake fluid and coolant have been serviced in line with calendar-based intervals rather than purely mileage, and inspect the condition of the timing chain, guides, and tensioner, which are known wear items on Mercedes-Benz V6 and V8 engines of this era, with a cold start listening specifically for any rattle from the timing chain area before oil pressure rises.