2009 BMW 730 3.0L Diesel · KR04 ADA

The 3.0-litre diesel BMW 730 is reasonably economical for its class, with real-world fuel economy typically ranging from 35 to 45 mpg depending on driving style. Annual road tax for a vehicle of this age and emissions class falls into a higher bracket, and insurance will likely sit in group 40+ given the car's value and performance, making premiums substantial. Maintenance costs are where this vehicle can sting — parts are premium-priced, and specialist labour at a BMW main dealer can easily run £100+ per hour. Items such as brake discs, suspension components, and electronic modules carry significant costs compared to mainstream saloons.

Estimated annual running costs for this vehicle, assuming average mileage of around 8,000 miles, would be approximately £1,800-£2,400. This covers fuel at current diesel prices, road tax, insurance, and a realistic maintenance budget for a luxury vehicle of this age. Buyers should also set aside a contingency fund of £1,000-£2,000 for unexpected repairs, particularly around suspension and electrical systems, which are common on E65/E66 generation 7-series cars as they age.

Reference the MOT history: the only advisory recorded was for an engine oil leak in 2023 (item 8.4.1 (a) (i)). When inspecting this vehicle, check the engine bay for any signs of fresh oil residue, particularly around the oil filter housing, valve cover, and lower engine area. Start the engine from cold and look for any smoke from the exhaust, which could indicate turbo or piston ring issues on the M57 diesel unit. Inspect the underside of the vehicle for dampness around the engine and gearbox, and check the condition of the oil on the dipstick — it should be amber to dark brown but not milky or excessively black.

Beyond the MOT record, physically inspect items that match the model's known weak points. Check all four tyres for even wear, as uneven wear can indicate alignment or suspension issues. Inspect the coil springs for any signs of corrosion or sagging — the model data shows this is a top failure reason across the 730 range. Examine the suspension arms and bushes for play by pushing down on each corner of the car and listening for knocking noises over uneven surfaces. Finally, test all electrical systems including iDrive, climate control, seat adjustment, and window operation, as electrical gremlins are well-documented on this generation of 7-series.