2018 BMW 6 Series 2.0L Diesel · FJ68 UPK

The 2.0-litre diesel BMW 6 Series should return approximately 45-55 mpg on a mixed driving cycle, dropping to around 40 mpg in town driving. Road tax sits in a reasonable band for a diesel of this age and engine size, though you should verify the current rate based on the exact CO2 figure. Insurance for the 6 Series is typically in the higher groups given its premium GT classification, so obtain quotes before committing.

Annual maintenance costs for a 6 Series diesel tend to be higher than mainstream saloons — expect £400-600 for a routine service at an independent BMW specialist, with main dealer costs considerably more. The diesel engine, timing chain, and associated components are the most likely source of significant bills as mileage increases. Budget around £1,200-£1,600 per year for combined fuel, tax, insurance, and maintenance on a vehicle of this profile and mileage.

Based on the MOT history, pay particular attention to all four tyres — check tread depth across the full width of each tyre, not just the centre, as the failures referenced inner edges and cuts that may not be immediately obvious. Uneven wear patterns across an axle typically indicate alignment or suspension issues, so a geometry check is essential. Inspect the wheels themselves for kerbing damage, particularly on the offside rear, which had the most serious tyre failure.

For the 2.0-litre B47 diesel engine specifically, check for any signs of timing chain stretch (rattling on cold start), oil leaks from the rear crankshaft seal, and DPF warning lights. The 6 Series body should be inspected for corrosion around wheel arches and sills — corrosion is the second most common MOT failure reason for this model according to aggregate data. Test all electrical systems including the iDrive infotainment, electric seat adjustment, and adaptive suspension if fitted, as repair costs for these can be substantial.