2013 Mercedes-Benz SL350 AMG Sport Auto 3.5L Petrol · HCZ 500

The 2013 Mercedes-Benz SL350 AMG Sport most recently passed its MOT on 2 April 2026 with no advisories or defects recorded, continuing an unbroken run of clean passes stretching back through 2025, 2024, 2023 and 2022. With five consecutive passes and absolutely no recorded defects, advisories or warning items across the most recent five test cycles, the documented maintenance trend is unambiguously stable, and arguably indicative of a vehicle that has been conscientiously prepared for each annual examination. From a purely regulatory standpoint, the absence of any recurring failure points for suspension, braking, lighting, tyres or exhaust systems is a positive signal and suggests that the car has not yet developed any chronic mechanical concerns severe enough to be flagged under the MOT inspection regime. For a 13-year-old high-end convertible of this calibre, such a clean sheet over half a decade of testing is genuinely notable and points to careful ownership or remedial rectification between tests. The recorded mileage of 45,254 miles against the vehicle's age equates to an annualised usage of roughly 3,481 miles, which is substantially lower than the typical 6,000 to 9,000 miles expected of a privately owned car in the UK. Such low average mileage can be read two ways: it may indicate a cherished, lightly used example that has covered predominantly short journeys, or alternatively it may reflect extended periods of standing or occasional use, both of which carry their own distinct mechanical implications. Periods of inactivity are particularly significant on an SL-Class of this vintage, as standing can accelerate corrosion on brake discs, promote binding in the caliper pistons, degrade rubber components through lack of flex, and cause the 12V battery to discharge repeatedly if the vehicle has not been maintained on a trickle charger. Equally, predominantly low-mileage use typically means the engine, automatic transmission and exhaust catalyst have rarely been brought up to full operating temperature, which can promote internal condensation, oil dilution and carbon accumulation in the intake and exhaust system. Given the clean MOT record combined with the very modest annual mileage, there are several physical checks that any prospective buyer should carry out personally rather than rely solely on the computerised history. The tyres should be examined closely for sidewall perishing and cracking, as thirteen-year-old rubber compounds will have hardened and degraded even if the tread depth remains adequate; Mercedes specification tyres of the correct speed and load rating should be confirmed. Brake discs should be visually checked for surface corrosion and any lipping on the outer edges, and the wheels should be spun by hand when cold to confirm that no caliper is binding after standing. The 12V battery should be load-tested, particularly given that the SL350's complex convertible roof and electronic control modules draw standing current that can flatten an ageing battery quickly, and the condition of the auxiliary battery in the boot should also be verified. All fluid services, including engine oil, automatic transmission fluid, brake fluid, coolant and power steering fluid, are time-sensitive rather than solely mileage-sensitive, and the service book should be scrutinised for evidence that these have been renewed in line with calendar intervals rather than purely by odometer reading. A thorough road test should pay particular attention to the symptoms most commonly associated with low-mileage SL350s, including any hesitation or rough idle that may stem from dried injector tips, fouled spark plugs or a tired air mass sensor that has not been exercised regularly. The seven-speed automatic transmission should be observed for smooth, decisive gear changes with no hesitation, flaring or rough downshifts, while the convertible roof mechanism should be operated twice in quick succession to confirm consistent functioning of the hydraulic rams, microswitches and latch assembly, which are known wear items on this chassis. On the suspension side, listen for any clonks or knocks from the front lower arms and anti-roll bar bushes over speed humps and uneven surfaces, and inspect the rear subframe mounting points for any signs of surface corrosion. Finally, the AMG Sport body styling, front splitter and side skirts should be examined for kerbing damage, and a compression test or full diagnostic read via STAR or ISTA tooling is strongly advisable given that low-mileage Mercedes V6 engines can develop guide wear or timing chain stretch that an MOT test alone will never reveal.