1986 Ford Sierra 2.0L Petrol · MOS 15S

Running costs for a 1986 Sierra will be driven less by fuel economy and more by parts availability and specialist labour. The 2.0-litre petrol engine is unlikely to deliver modern efficiency — expect roughly 25-30 mpg in mixed use, depending on condition. Road tax for a vehicle of this age is now nil on classic pre-1984 rules, but this 1986 car is post-exemption, so standard VED rates will apply, currently in the lowest band for older low-emission vehicles. Insurance is likely to be modest given the car's age, but specialist classic cover is advisable.

Maintenance costs are the real consideration. Tyres, brake components, and fluid items are reasonably priced, but body panels, trim, and certain mechanical parts for the Sierra are increasingly scarce, which can push up repair bills. Budget realistically for occasional specialist labour and the possibility of having to source parts from breakers or specialist suppliers. Estimated annual running cost: £600-£900, assuming limited mileage and careful ownership.

The MOT history shows no recorded defects across the three tests listed, but the gap between July 2022 and June 2025 means the vehicle was apparently off the road for nearly three years — worth asking about directly. On a Sierra of this age, the critical inspection points are structural: check the inner and outer sills, rear chassis legs, jacking points, and the area around the rear suspension turrets for corrosion, as these are well-known weak points on later Sierras.

Mechanically, the 2.0-litre Pinto-derived engine in this car should be inspected for oil leaks from the cam cover and front crank seal, cooling system condition (radiator, hoses, and water pump given the car's age), and the condition of the timing belt or chain depending on specification. Examine the underside for any signs of fluid staining, and test all electrical items including the heater blower and lighting, as wiring degradation is common on cars of this era. Finally, verify that the mileage is consistent with the car's overall condition and any documentation held.