Fault File
All models / All cars / Coupés, convertibles & GT / BMW 6 Series

BMW 6 Series

All generations and engines together · 16,163 MOT tests in the 2025 data · typical mileage at age 7: 63k

Reliability verdict
CBy age
BBy miles

Graded against its peers

Middling for its age among coupés and convertibles, and better than most per mile driven. Watch suspension and corrosion. A fair used buy, provided its MOT history has no repeating suspension advisories.

First-time failure at age 7
14.9%
Across 2,000 tests. The average for coupés and convertibles is 14.8%.
First-time failure at 50-60k miles
14.0%
Across 1,806 tests. The average for coupés and convertibles is 17.9%.
Rank in its class
12 of 19
1 = lowest failure rate among the 19 coupés and convertibles we can rank.
Typical mileage at age 7
63k miles
How far the average car has gone by seven years old. Low-mileage models can look better by age than they are.

Generation

Split by first-registration year. Cars registered in a changeover year can belong to either generation.

What owners report

Reported

Owner folklore from forums and the motoring press, with how well each report stands up. Most of it never shows up in an MOT, which is why this section exists at all.

Oil consumption, timing chain and injector wear on the N63 twin-turbo V8

Confirmed patternPetrol V8 (650i) only

The 4.4 twin-turbo V8 in the 650i (F06/F12/F13) is prone to rising oil consumption between services, along with timing chain stretch and fuel injector wear as the miles rack up. BMW acknowledged the pattern in North America with a Customer Care Package covering timing chain, injectors, mass air flow sensor and vacuum pump from late 2014, and US regulators were still logging fresh oil-consumption and battery-drain complaints on the same engine in 2019. UK cars share the identical engine but not that US goodwill programme, so an out-of-warranty repair can run into four figures. Doesn't affect the 640i/640d six-cylinder cars.

Reported through 650i ownership, worsening from around 60-80k miles · sources: BMW N63 engine records (NHTSA complaint filings, BMW Customer Care Package)

Diesel-only faults: EGR cooler recall and a 2022 fire-risk statement

Confirmed patternDiesel only

635d/640d cars (and the Gran Turismo's 620d/630d) were subject to a manufacturer recall to replace a faulty EGR cooler; Honest John logged an owner case where the repair kept the car off the road for two months. Separately, BMW issued a statement in January 2022 acknowledging a technical fault in the same N57 diesel family that had caused fires in UK cars driven hard after long periods of idling, prompting some police forces to pull the model from service. It's more relevant to ex-fleet or ex-police cars with heavy idling patterns than typical private use, but worth checking on any diesel with a fleet history.

Diesel engines only · sources: Honest John (6 Series and Gran Coupe reviews), BMW statement reported January 2022

Suspension wear and the Gran Turismo's self-levelling rear axle

Partly in the MOT data

The measured MOT data for this model's coupe/GT segment flags suspension as the standout fault category, and owner reports back it up from a different angle: firm M Sport suspension on 19in wheels is described as harsh over poor surfaces, and the Gran Turismo's standard self-levelling rear air suspension is called out by the motoring press as expensive to put right if it fails. It's the kind of fault that stays invisible at MOT time right up until it sags or fails outright, so a level, settled ride height at a viewing matters more than the test's pass record.

Reported across the range, air suspension specifically flagged on the GT · sources: Auto Express, Honest John

Firm ride and creaking bushes as the miles add up

Disputed

Owners and reviewers disagree on where the line sits between factory firmness and worn components. Honest John's own review notes the M Sport set-up with low-profile tyres gives a taut ride that some drivers find uncomfortable on rough tarmac from new, which makes it harder for a buyer to tell whether a knock or crash from the front end is normal for the car or a sign of tired bushes, drop links or dampers. There's no recall or fix beyond the usual wear-and-tear replacement, typically a few hundred pounds per corner.

Reported from new on M Sport cars, wear complaints building with age · sources: Honest John

What to check on this car

Ranked from this model’s own MOT record, then from what owners report.

Saveable checklist

From this model’s MOT record

The physical checks its own defect data says are worth your time, most telling first.

Rubber boots and gaitersRuns high on this model On full steering lock, look in behind each front wheel at the concertina rubber boots on the driveshafts and steering rack. Splits, or grease flung around the arch, mean dirt is getting into a joint that costs far more than the boot protecting it.Recorded on 2.2% of tests at age 6-9 · class average 0.1%
Bushes and ball joints Drive slowly over broken tarmac with the windows down and listen for clonks from either end. Back at the car, have someone rock the steering wheel while you rest a hand on each front wheel; play you can feel through the tyre is a worn joint.Recorded on 2.9% of tests at age 6-9 · class average 5.9%
Coil springs Look through the wheel spokes at the bottom coil of each spring; when springs snap it is usually there, and the break is visible. Step back and check the car sits level too. A dropped corner is often a broken spring.Recorded on 1.1% of tests at age 6-9 · class average 1.4%
Leaks Look at the ground where the car usually stands, then glance under the engine after your test drive. Fresh drips of oil or coolant are the cheapest warning you will ever get about a car.Recorded on 1.0% of tests at age 6-9 · class average 2.0%
Brake pipes underneath Follow the metal brake lines with a torch where they run along the sills and over the rear axle. White crust or flaking metal means they are corroding, and the online MOT history usually shows the same advisory creeping up for years before the fail.Recorded on 0.9% of tests at age 6-9 · class average 1.9%
Wheels Look at each rim for kerb damage and check no wheel nuts are missing. A steering wheel that shimmies between 50 and 60 on the test drive often turns out to be a buckled or badly balanced wheel.Recorded on 0.9% of tests at age 6-9 · class average 0.1%
Dampers Look for oil misting on the damper body behind each wheel, then push down hard on each corner of the car. It should settle in one bounce. A floaty or crashy ride on the test drive is the same fault felt from the driver's seat.Recorded on 0.9% of tests at age 6-9 · class average 2.3%

Worth doing on any used car

These judge the seller’s upkeep rather than the model, and they are where the haggling money is.

Tyres, all four Check the tread across the full width of each tyre, inner edge included, and look for cracking and mismatched brands. A set of decent tyres is £500 or more on most cars, which makes this the easiest money to take off a price. If the pressure warning light is on, budget for sensors too.Recorded on 16.8% of tests at age 6-9 · class average 20.1%
Pads and discs Look through the wheel spokes at the brake disc. A pronounced lip on its outer edge, or a rusty and scored face, means discs and pads are due all round, a few hundred pounds on most cars. A haggling point rather than a reason to walk away.Recorded on 6.3% of tests at age 6-9 · class average 8.7%
Windscreen and wipers Scan the glass in daylight for chips, especially in the driver's line of sight where even a small one can fail the MOT. Run the washers and check the wipers clear without smearing.Recorded on 2.0% of tests at age 6-9 · class average 2.0%

Because of what owners report

Drawn from the reports above rather than the MOT data. These are the model-specific ones.

Check the oil level and ask for recent oil top-up history on 650i (V8) cars. Low or noticeably dark oil, or a vague answer, points to the N63's known oil-consumption pattern.
On the test drive, floor it briefly from low revs and watch for hesitation or a warning light. Rough running under load can mean injector or timing chain wear on the V8.
Check the V5 and service book for the EGR cooler recall having actually been carried out on diesel cars. If it's not stamped, budget for the work or get the dealer to sort it before you buy.
On an ex-fleet or ex-police diesel, ask about typical duty cycle (lots of idling then hard driving). That usage pattern is what BMW's 2022 statement linked to the fire-risk fault on N57 diesels.
Look at ride height at all four corners, front and back, ideally on level ground. A sagging or lopsided rear end on a Gran Turismo means the self-levelling air suspension is on its way out.
Push down hard on each corner and let go, listening for knocks or creaks. Clonks point to worn bushes, drop links or dampers, common as these cars age regardless of engine.
Take it over a rough road or speed bumps, not just a smooth test route. A harsh ride on 19in M Sport wheels may just be the factory setup, don't mistake it for damage or write it off as a fault without checking history.

The MOT data

Measured

Computed from DVSA MOT results, all of Great Britain, 2025. Nothing here is opinion.

How this model wears

BMW 6 SeriesClass average, all tracked models

What testers flag

Share of tests where each item was recorded. The dark tick is the class average across all tracked models; bars are scaled within each group.

Faults with the car itself

The rows that judge the model rather than its keeper. 7,337 tests in this band.

A suspension pin, bush or joint excessively worn
Advisory
2.9%class 5.9%
A transmission shaft flexible coupling excessively deteriorated
Advisory
2.2%class 0.1%
A spring or spring component fractured or seriously weakened
Fail
1.1%class 1.4%
Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users
Advisory
1.0%class 2.0%
Any fracture or welding defect on a wheel
Fail
0.9%class 0.1%
Brake pipe damaged or excessively corroded
Advisory
0.9%class 1.9%
A wheel badly distorted or wear between wheel and hub at spigot mounting
Advisory
0.9%class 0.6%
A shock absorber damaged to the extent that it does not function or showing signs of severe leakage
Advisory
0.9%class 2.3%
A transmission shaft constant velocity joint boot severely deteriorated
Minor
0.8%class 0.6%
A wheel with a loose or missing wheel nut, bolt or stud
Fail
0.7%class 0.2%

Wear, upkeep and luck

Tyres, pads and stone chips say more about how the car was driven and maintained than about how it was built.

Tyre tread depth not in accordance with the requirements
Advisory
19.6%class 22.9%
A tyre seriously damaged
Advisory
7.4%class 13.4%
A brake lining or pad worn below 1.5mm
Advisory
6.3%class 8.7%
A tyre seriously damaged
Fail
5.1%class 2.5%
Brake disc or drum excessively weakened, insecure or fractured
Advisory
4.2%class 10.1%
Brake disc or drum significantly and obviously worn
Advisory
2.3%class 3.4%
Nail in tyre
Advisory
2.1%class 1.6%
A tyre cords visible or damaged
Fail
2.1%class 1.2%

Others in its class

Same segment (Coupés, convertibles & GT), best MOT record first. Compare before you shortlist.