2009 Mercedes E320 CDI Sport Auto 3.0L Heavy oil · BHZ 7077

The E320 CDI is powered by a 3.0-litre V6 diesel producing respectable economy for an executive saloon of this size — typically in the region of 35-42 mpg in real-world mixed driving, depending on journey type and driving style. As a 2009 diesel, road tax will fall in a higher band than more recent vehicles, so budget accordingly. Insurance for an E-Class of this age is generally moderate but depends heavily on the driver's profile and any tracker fitted.

Maintenance costs on Mercedes E-Class diesels are noticeably higher than mainstream brands, particularly for parts such as brake discs, suspension components, and the diesel-specific emissions equipment. Budget for premium servicing at a specialist rather than a general garage if you want the car to remain reliable. Estimated annual running costs, covering fuel, insurance, road tax, and routine maintenance, are likely to fall in the £1,400-£1,800 range for a vehicle of this age and mileage. Be aware that ad-hoc repairs on a 17-year-old German executive car can easily push annual costs higher if major components fail.

Because the MOT history is notably clean with zero advisories recorded across four tests, the usual MOT-driven inspection checklist provides little direct guidance from the records themselves. Instead, focus inspection efforts on areas outside MOT scope: check the condition of the 7G-Tronic automatic gearbox, including smooth changes and any sign of torque converter judder or delay engaging drive. Inspect the underside of the vehicle for oil leaks from the OM642 engine, particularly around the oil filter housing, front crankshaft seal, and turbo oil feed lines — these are common seepage points on this engine.

Examine the condition of the diesel particulate filter and request evidence of recent long motorway journeys or forced regenerations, as low annual mileage over many years can accelerate DPF issues. Check the operation of the electric seats, air conditioning, and infotainment system, as electrical faults in Mercedes of this era can be expensive to rectify. Inspect the alloy wheels for kerbing damage and verify all four tyres are matching in brand and tread depth, which would suggest careful ownership. Finally, examine all body panels for corrosion along the boot lid, wheel arches, and door bottoms, and ensure the VIN plate is original and unfaded.