2004 Mercedes-Benz SLK 3.5L Petrol · DP04 AAA

The vehicle presented a PASS outcome at its most recent DVSA MOT examination on 10 August 2026, though it carries an unusually heavy advisory listing for a single test. Five separate advisories were issued, covering a corroded nearside rear fuel pipe, pitted rear brake discs, a defective central exhaust mounting, corroded ferrules on both rear brake hoses, and a fluctuating nearside rear service brake. Although none of these items warranted a failure, the cumulative picture suggests that a prospective buyer should treat the braking and fuel delivery components as candidates for near-future remedial attention. Comparing this result to the previous two test cycles confirms a progressively worsening rather than stable trend: the 2024 and 2023 tests recorded no advisories at all, the 2025 test introduced front disc pitting and front suspension arm ball joint play, and the 2026 test has added further brake and fuel system concerns. The 2025 test itself was initially failed on both headlamp lenses, which is a straightforward lighting rectification, but the simultaneous appearance of suspension play is noteworthy when assessing the longer-term mechanical trajectory. With 82,939 miles recorded over approximately 22 years, the vehicle averages around 3,770 miles annually, which is substantially below typical usage for a car of this age. Low recorded mileage of this nature frequently reflects either genuinely light running or extended standing periods between use, and on a Mercedes-Benz SLK of this vintage both interpretations carry mechanical implications. Limited use tends to accelerate certain age-related deterioration that higher mileage would otherwise mitigate, particularly corrosion of underfloor and chassis components, drying and cracking of rubber elements such as bushes, gaiters, and seals, and degradation of fluids by calendar age rather than by service interval. It also elevates the risk of seized brake calipers, pitted and corroded brake discs from infrequent application, and a 12V battery that may have suffered chronic undercharging. Equally, the annual MOT cycle has been maintained consistently without any recorded gaps, suggesting the vehicle has been regularly presented for testing even if it has not been driven extensively. Given the advisory items recorded over the 2025 and 2026 examinations, particular attention should be paid during a pre-purchase inspection to the braking system as a whole. The recurrence of pitted brake discs, now extending to both front and rear axles, indicates progressive wear that will eventually require disc replacement rather than merely resurfacing; on a test drive, the buyer should listen for brake shudder or vibration through the steering wheel under firm pedal application, and feel for any pulling to one side that would suggest uneven caliper operation. The advisories relating to brake pipe corrosion, brake hose ferrule corrosion, and fluctuating rear brake effort collectively warrant a thorough visual examination of the underbody braking hardware, with any signs of active weeping or seeping taken seriously. The fuel pipe corrosion advisory on the nearside rear and the earlier 2021 advisory regarding corroded rear fuel pipes suggest an ongoing deterioration pattern in the fuel delivery system that should be inspected for surface rust, weeping joints, and any smell of petrol when the engine is warm. Beyond the recorded advisories, the buyer should undertake a comprehensive age-related inspection consistent with a low-mileage 22-year-old Mercedes-Benz SLK. Tyre sidewalls should be examined closely for perishing and cracking, as tyres older than around six years from their DOT date stamp will harden and lose grip regardless of remaining tread depth, and a spare should be checked equally. The coolant, brake fluid, power steering fluid, and automatic transmission fluid should all be regarded as time-expired given the vehicle age and likely original fill dates, with brake fluid in particular being hygroscopic and due for renewal on a calendar basis every two years regardless of mileage. A 12V battery load test is advisable, as low annual mileage commonly results in chronically undercharged units. The folding roof mechanism, a known service-intensive item on the R170 SLK, warrants functional verification including full open and close cycles with attention to hydraulic leaks, pump noise, and latch engagement. Finally, the underside should be examined on a ramp for standing corrosion on structural elements, sill condition beneath the fitted covers noted on the 2021 test, exhaust mounting integrity given the 2026 advisory, and general evidence of fluid residue from the engine, transmission, and differential, all of which would be consistent concerns for a low-mileage example of this age and would inform any subsequent offer.