2008 Mercedes SLK 3.0L Petrol · KM08 NGZ
2008 Mercedes SLK (3.0L, petrol). First registered 01 Apr 2008. Recorded mileage 74,903 miles. MOT expired on 05 Jun 2026. Taxed until 01 Jul 2026.
- Make & Model
- MERCEDES SLK
- Year / Origin
- 2008 · Northampton
- Safety Recall
- Unknown
- MOT Status
- Expired on 05 Jun 2026
- Road Tax
- Taxed (01 Jul 2026)
- Recorded Mileage
- 74,903 mi
- ULEZ Compliance
- ULEZ Compliant (Euro 4+)
- Fuel & Engine
- PETROL · 3.0L
- Reliability Guide
- Available on IAGC
Archived Record
Registration no longer recorded by DVLA. This usually means the vehicle is now using a private plate.
Thinking of buying this vehicle? Free MOT and tax checks do not cover legal ownership. If outstanding finance exists, finance companies have legal right to repossess without compensation.
KM08 NGZ Key Findings
- 5 MOT tests recorded
- Latest MOT passed on 16/05/2025
- 74,903 miles recorded at latest MOT
- 1 historical MOT failure
- 11 defects noted at the latest MOT
- Recurring brakes items (16 mentions)
Derived directly from the recorded DVSA and DVLA data shown on this page.
KM08 NGZ MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
5 MOT tests are recorded for this 2008 Mercedes Slk (KM08 NGZ) between May 2022 and May 2025.
The record contains 4 passes and 1 failure.
The most recent test on 16 May 2025 was a pass, although the earlier record includes 1 failure that buyers may want to investigate.
Across all tests, the most frequently flagged areas are: Brakes (16 issues), Suspension (16 issues), Bodywork (4 issues), Steering (1 issue), Tyres (1 issue). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
In total 47 advisory notices are recorded. Advisories flag items that passed but may need attention before the next test; they are not evidence of how well the vehicle has been serviced.
Recorded failure items include: “Offside Front Outer Track rod end ball joint has excessive play (2.1.3 (b) (i))”; “Nearside Front Coil spring fractured or broken (5.3.1 (b) (i))”.
KM08 NGZ Mileage History
- 10/05/202260,835 mi
- 26/05/202365,834 mi+4,999 mi
- 01/06/202365,834 mi
- 18/05/202470,298 mi+4,464 mi
- 16/05/202574,903 mi+4,605 mi
Average of roughly 4,663 miles per year across 5 recorded odometer readings.
Technical Specifications
Core Specifications
Identification & Status
Dimensions & Weights
Diagnostic & Valuation Intelligence
Estimate current market value
Generate an instant valuation benchmark based on live market listings, vehicle mileage, and recent dealer auction figures.
MOT Roadworthiness: Average
This rating reflects historical MOT pass rates and recurring advisory wear patterns from official DVSA test logs. Note that roadworthiness does not verify outstanding finance, insurance write-offs, or stolen records.
Verify lender finance agreements, insurance write-offs, police stolen registers, and mileage rollback.
Buyer's Guide & Inspection Advisory
Expert automotive synthesis from historical MOT defect records and market benchmarks.
Our Verdict
Avoid this SLK without substantial price
Given the SLK is now 18 years old, the corrosion pattern seen here is a classic age-related issue rather than a unique fault, but the rate of progression is the concern. Between 2022 and 2025 the advisory count roughly doubled, and the 2023 test included a fail for a fractured nearside front coil spring and an offside front track rod end with excessive play — both safety-critical items. Any prospective buyer should insist on seeing invoices for the replacement of the track rod end and coil spring completed after the 2023 fail, and should budget for imminent brake pipe and subframe work.
Mileage progression is reasonable at roughly 4,500–5,000 miles per year over the period covered, suggesting a second-use rather than a daily driver. However, the outer sill covers noted at every test could be concealing structural corrosion on the sill panels themselves — these covers must be removed for a proper inspection. Walk away if the seller cannot or will not allow an underside inspection on a ramp. Also verify the folding roof mechanism operates fully, as this is a known cost area on the R171 SLK and is not assessable from MOT data alone.
The 2996cc V6 petrol engine in this SLK will return around 25–30 mpg in mixed use, dropping noticeably with spirited driving. Road tax falls in a higher band due to the engine size and CO2 output — budget roughly £330 per year. Insurance for an 18-year-old performance Mercedes convertible typically sits in groups 40–45, so premiums for most buyers will be substantial, particularly for under-35s.
Annual maintenance is likely to be the biggest variable cost. Routine servicing on the M272 V6 is straightforward for a specialist but parts are pricier than mainstream marques, and the known balance shaft/oil pump drive issue on early M272 engines is worth investigating. Factor in £800–£1,500 per year for routine maintenance, plus a contingency for the corrosion-related work flagged in the MOT history. The realistic all-in annual running cost is likely to be in the £2,400–£3,000 region, especially if brake pipe and suspension refurbishment is required soon.
The MOT history repeatedly flags corroded brake pipes at all four corners and corroded rear subframe mountings, so a thorough inspection of the brake line network and the rear subframe-to-chassis interfaces is essential. The 2023 fail for a fractured nearside front coil spring and excessive play in the offside front track rod end means the front suspension geometry, bushes, and steering components must be checked for wear — these items may have been replaced but the surrounding components could now be showing secondary wear.
The outer sill covers and undertrays noted at every test mean the sill panels, floor pans, and chassis rails cannot be properly assessed without their removal. Insist on a ramp inspection. Pay particular attention to the rear subframe mounting areas, which have been flagged as corroded but not considered excessive — this is the stage just before they would fail an MOT, so repair may be imminent. Also inspect the folding roof mechanism, rear brake calipers (binding noted in 2023), and check for oil leaks from the engine and transmission, which are common on high-mileage V6 Mercedes of this era.
This 2008 Mercedes SLK with the 2996cc petrol engine has covered 74,903 miles across four recorded MOT tests since 2022. The record shows one outright failure (2023) followed by a pass, but advisories have accumulated rapidly — from a handful of corrosion notes in 2022 to nine corrosion-related advisories in 2025. The pattern indicates accelerating deterioration of brake pipes, coil springs, subframe mountings, and the rear subframe itself. With no aggregate reliability data for the model available, the MOT history is the primary indicator and it raises serious concerns.
No aggregate MOT reliability data is available for the Mercedes SLK in our reference set, so model-level reliability reputation cannot be quantitatively assessed from this source. The individual vehicle record shows age-related corrosion issues that are common to vehicles of this vintage rather than specific to the SLK nameplate.
Reviewed by the IsItAGoodCar editorial team — Verified automotive analysis synthesized from official vehicle registries.
Data Sources
DVSA
Official MOT test logs & failure reasons
DVLA
Tax, registration & powertrain specs
Experian
Finance, stolen markers & total loss
AI Analysis
Historical fault & advisory patterns
Vehicle & Plate History
Other vehicles on this plate
Similar Vehicles
Similar Vehicles Checked Recently
Plate Neighbors
Batch Registration Neighbors (KM08 Series)
Vehicles registered in the same regional DVLA batch as KM08NGZ.
BMW
118
BMW
118
MINI
MINI
BMW
R1200
BMW
520
PEUGEOT
207
PEUGEOT
BOXER
PEUGEOT
BOXER
PEUGEOT
BOXER
PEUGEOT
BOXER
PEUGEOT
107
MERCEDES-BENZ
C
Regional DVLA Registration Directory
Vehicles and registration batches issued by regional DVLA offices across the UK.
Recently Checked UK Vehicles
Live vehicle history checks and MOT records recently queried by UK car buyers.