2012 Mercedes-Benz C 2.1L Diesel · NA62 LRO

The 2.1-litre C220 diesel should return approximately 50–60 mpg on a steady run and around 40–45 mpg in mixed use, making it economical for its class. Annual road tax for a diesel of this CO2 bracket is typically £35–£165 depending on the exact variant, though older diesels registered before April 2017 with Euro 5 compliance tend to sit in lower bands. Insurance for a 2012 C-Class diesel usually falls within groups 22–32, which translates to a typical premium of £450–£650 per year for a standard UK driver.

Routine maintenance such as an annual service with oil and filter changes generally costs £200–£350 at an independent specialist, whereas main dealer servicing can run considerably more. Common replacement parts including brake discs and pads, tyres, and battery tend to be reasonably priced from quality aftermarket suppliers. Given the brake advisories on the latest MOT, budget for front brake work in the first few months of ownership.

Begin with a physical inspection of the front brakes as flagged in the February 2024 MOT, checking pad thickness visually and feeling for lipping on the front discs which would necessitate replacement alongside pads. The brake pipe corrosion advisories on both nearside and offside fronts warrant a thorough underneath inspection for any signs of fluid leaks or further corrosion; ask the seller whether the pipes have been treated or replaced since the test. Listen for any grinding or squealing when test driving, particularly at low speed.

Because the MOT record shows no brake-related items prior to February 2024, the recent emergence of these advisories may indicate the vehicle has been standing or used predominantly for short journeys, both of which can accelerate corrosion on underbody components. Inspect the underside carefully on a ramp if you can arrange one, paying attention to the exhaust mounting, suspension arms, and anti-roll bar bushes which are known wear items on the W204 chassis.

The 2.1-litre OM651 diesel should be started from cold during your viewing; listen for any rattle from the timing chain area on initial startup, which can indicate stretch and would warrant further investigation. Check for any smoke on startup that should clear quickly, and ensure the engine management light extinguishes promptly. Finally, verify all electrical functions including the infotainment screen, electric windows, and central locking, as COMAND system faults and window regulator failures are reported on this generation.