2005 Mercedes-Benz CL 500 5.0L Petrol · BL55 FWU

The most recent MOT on 14 October 2023 was passed, but it carried two advisories – general corrosion throughout the under‑body and defective rear‑exhaust mounting brackets on both sides. Earlier tests show a pattern of recurring rear‑exhaust bracket failures (noted in 2016 and again in 2015) and a series of tyre‑wear advisories from 2014 onward. Although the vehicle has consistently cleared the MOT, the persistence of the exhaust‑mount issue and the growing corrosion indicate a maintenance trend that is holding steady rather than improving, and it warrants close attention before purchase. With a recorded 83 649 miles on a 2005 model, the average annual mileage is roughly 4 000 miles, well below the typical UK usage of 8‑10 000 miles per year. Such low utilisation often points to long periods of inactivity or very gentle driving, which reduces mechanical wear on the engine, transmission and suspension but accelerates age‑related degradation of rubber components, fluids and metal corrosion. The modest mileage does not eliminate the need for thorough inspection of items that deteriorate with time rather than use. A prospective buyer should give the rear‑exhaust system a detailed examination. Look for cracked or rusted brackets, loose bolts and any audible rattles or exhaust leaks at low engine speeds, especially when the vehicle is jolted over bumps. Verify that the mounting points on the chassis and sub‑frame are free of severe corrosion that could compromise structural integrity. Inspect the tyre tread depth and sidewall condition on all four wheels; even if the current tread meets legal limits, tyres older than six years may have perished rubber, so check the DOT date code. During a test drive, listen for clunking from the rear suspension, note any vibration or shudder under acceleration that could signal a failing exhaust mount, and assess the brakes for surface rust on the discs, uneven pad wear or a pulsating pedal, all common after prolonged storage. Because the car has spent much of its life at low mileage, additional age‑related checks are essential. Examine the under‑carriage for rust, particularly around suspension mounting points, fuel lines and the battery tray, and ensure the battery is tested for cranking voltage and capacity. Confirm that all exterior lighting – headlamp aim, registration‑plate lamps and rear‑wiper operation – functions correctly, as several MOTs recorded failures in these areas. Finally, verify that the engine oil, coolant, brake fluid and power‑steering fluid have been changed within the recommended intervals (typically every 12‑24 months for fluids in a vehicle of this age); stale fluids can cause internal wear even on a low‑mileage engine. A comprehensive visual and functional inspection covering these points will give a clear picture of the car’s roadworthiness and any imminent maintenance costs.