2013 Mercedes-Benz CLS 5.5L Petrol · WN63 XCF

The most recent MOT test conducted on 27 October 2025 resulted in a fail due to two major advisories concerning nearside and offside rear sub-frame attachment brackets being insecure, alongside a minor advisory for an insufficient windscreen washer supply. It is worth noting that the vehicle subsequently passed an MOT on the same date, indicating that the sub-frame mounting issues were likely rectified to a satisfactory standard prior to re-test. Earlier records show consistent pass certificates with no defects between 2019 and 2024, suggesting an otherwise stable maintenance profile. However, the appearance of two major structural advisories on the rear sub-frame after several years of clean tests is a point worth scrutinising, as sub-frame corrosion or mounting point degradation on a thirteen-year-old Mercedes-Benz can indicate either isolated component failure or underlying structural concerns that may resurface. The brake-related advisories recorded in October 2023, covering thin front and rear pads as well as worn and pitted brake discs, were minor and consistent with the vehicle's mileage at that stage, but any prospective buyer should verify that appropriate remedial work has since been carried out. Annual mileage of approximately 7,244 miles is broadly typical for a vehicle of this age and represents moderate use rather than excessive motorway mileage or extended periods of standing. There is no evidence in the recorded history of unusually high accumulation in any single year or extended gaps that would suggest the vehicle has been laid up for prolonged periods. This average usage pattern implies that wear items such as brake components, tyres, and suspension parts should have degraded at a predictable rate, though it also means that fluids, hoses, and rubber components may still suffer calendar-based degradation regardless of the relatively modest annual distance covered. The consistency of the mileage between tests suggests regular, if not heavy, use which is generally favourable for preserving mechanical integrity. Given the age of the vehicle and the specific defects identified, a prospective buyer should pay particular attention to the rear sub-frame mounting areas, visually inspecting for any signs of repair such as fresh welding, repainted surfaces, or evidence of underseal being reapplied over the mounting brackets, as well as checking for any residual corrosion around these structural points. On a test drive, listen for any suspension knocking or clunks from the rear, particularly over uneven surfaces or when cornering, and feel for any vagueness or instability in the rear handling that could suggest compromised mounting integrity. The brake system should be evaluated for pulling, shuddering under heavy braking, or any grinding sensations, given the 2023 advisories regarding pad wear and disc pitting, and the discs should be physically inspected through the wheels for lipping, surface corrosion, or uneven wear patterns that would indicate caliper binding or warped discs. Beyond the recorded defects, a thirteen-year-old Mercedes-Benz CLS of this mileage warrants a thorough inspection of items that deteriorate with age rather than use. Tyres should be examined closely for sidewall perishing and cracking, as rubber compounds harden over time even on lightly used vehicles, and the production date code should be checked to ensure they are not excessively old. The 12V battery should be tested for its state of charge and cranking performance, as battery failure is a common cause of non-starts in vehicles of this age, and any standing periods may have shortened its service life. All fluid levels and their condition should be verified, particularly brake fluid which absorbs moisture over time and is typically due for renewal regardless of mileage, along with coolant, which can lose its protective properties through calendar ageing. Finally, the service history documentation should be reviewed to confirm that scheduled maintenance, including cambelt replacement where applicable to the engine variant, has been carried out at the correct intervals as specified by Mercedes-Benz.