2004 Mercedes-Benz SLK 2.0L Petrol · NC04 GLJ

As a 1.8-litre petrol engine, you can expect moderate fuel consumption, likely averaging 30-35 mpg depending on driving style. Road tax for a 2004 vehicle will be calculated based on CO2 emissions, which may be higher than modern equivalents, so check the V5C for the specific tax bracket.

Insurance may be surprisingly reasonable due to the car's age and lower annual mileage, though it remains a premium brand. Budget for an annual maintenance fund of at least £600-£800 to cover the inevitable age-related repairs, such as the suspension and brake components highlighted in recent MOTs. Total estimated annual running costs, excluding fuel, are approximately £1,200-£1,500.

Pay close attention to the tyres; the 2026 MOT noted cracking/perishing, which is a safety concern regardless of tread depth. Inspect the underside for any further signs of corrosion, particularly around the anti-roll bars and suspension arms, as these were flagged in 2025. The exhaust mounting should also be secured promptly to prevent further vibration damage to the system.

Additionally, inspect the headlamp lenses, which have been noted as slightly defective in previous tests; ensure they are clear enough for optimal night-time visibility. Finally, check the CV boots for any signs of grease leakage, as the 2025 report identified severe deterioration in this area, which can lead to expensive joint failure if left unaddressed.