Used car guide

2015 MG 6: common problems and what to check

What gets flagged at MOT on 2015 MG 6s, from 329 tests in 2025, plus known faults and what to look at before you buy one.

Small sample: only 329 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.

329MOT tests in 2025
63%pass first time (all 2015 cars: 72%)
7,300typical miles a year
8.5×the usual rate for rigid brake pipes

What stands out

Parts flagged at MOT more often on 2015 MG 6s than on all cars registered in 2015.

  • Rigid brake pipes8.5× usual
    MG 6
    21.3% All 2015 cars
    2.5%

    Failed outright at MOT: 4.6%, against 0.3% of all 2015 cars. The rest were advisories or minor defects.

    Rough price £100–£400 our estimate

    At the viewing: Ask to see underneath, or check the MOT advisories: corroded brake or fuel pipes get worse every year and fail the MOT when they do.

  • Coil springs2.6× usual
    MG 6
    14.3% All 2015 cars
    5.4%

    Failed outright at MOT: 2.4%, against 3% of all 2015 cars. The rest were advisories or minor defects.

    Rough price £175–£400 (pair, one axle) ClickMechanic

    At the viewing: Look behind each wheel for a snapped spring coil, and listen for a clunk or twang when turning the wheel lock to lock with the car stopped.

  • Engine oil leaks2.7× usual
    MG 6
    9.1% All 2015 cars
    3.4%

    Failed outright at MOT: 0%, against 0.1% of all 2015 cars. The rest were advisories or minor defects.

    Rough price £80–£600 our estimate

    At the viewing: Look under the engine and where the car is usually parked for fresh oil. Ask whether the leak has been looked at.

By area

The share of 2015 MG 6 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Brakes
    43% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Tyres
    33% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Suspension
    30% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Lights and electrics
    26% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Oil and fluid leaks
    10% of testsRough price £80–£600

    At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.

  • Wipers, windscreen and mirrors
    5% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

Looking at an MG 6?

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Other years

YearMOT testsMost flagged
2016276Brakes 39%
2014331Suspension 47%
2013177Suspension 45%
2012329Suspension 57%
2011131Suspension 51%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2015 MG 6s registered in 2015. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score