2009 Mercedes-Benz CLC 2.1L Diesel · OV59 CSU

The 2.1-litre diesel CLC should return around 40-45 mpg in mixed driving, dropping into the mid-30s for primarily urban use, depending on driving style. Road tax for a 2009 diesel of this engine size typically falls in a higher bracket than modern equivalents, so check the current VED band before purchase as this can add meaningfully to annual costs. Insurance on a sporty three-door Mercedes coupe tends to sit in the middle groups, so obtain a quote before viewing.

Maintenance costs are the key consideration here: parts for Mercedes are pricier than mainstream brands, and the 2026 advisories suggest brake discs and suspension bushes are due. Budget realistically for £400-£800 of work in the first year of ownership even if the car passes its next MOT. Annual running costs including fuel, tax, insurance and routine maintenance are likely to land in the £1,400-£1,900 range.

Focus your inspection on the items flagged in the July 2026 MOT: jack up the front and check the upper Macpherson strut pin and bush for excessive play, as this is a known wear point that can progress to an MOT failure if left. Inspect the rear brake discs for lip and corrosion, and the offside front anti-roll bar linkage ball joint dust cover for splits, as the advisory suggests it is already deteriorated. All four tyres should be checked for tread depth, sidewall cracking and even wear patterns, given the 2025 failure.

Beyond the MOT notes, this generation of Mercedes diesel is known for oil leaks from the balancer shaft seal and injector seals, so inspect the underside for damp patches and the engine bay for signs of fresh oil. The EGR valve and intake manifold can carbon up on high-mileage diesel Mercs, leading to rough running and warning lights. Finally, check the electronic handbrake operation thoroughly, as Mercedes electric handbrake calipers can seize or fail to release on older models, and any fault here can be expensive to remedy.