Used BMW 5 Series Buying Guide: The N47 Chain, the September 2011 Cutoff, and What the MOT History Shows
Used BMW 5 Series buying guide: N47 timing chain cutoff date, what the DVSA record shows, F11 Touring underpricing, G30 B47 as the safe choice. Budget £8,000–£30,000.
By Dean Griffiths · Published
One fact defines every F10 diesel purchase — everything else is secondary
The BMW 5 Series F10 offers executive car quality at a price that depreciation has made accessible. The catch is the N47 diesel engine on pre-September 2011 cars — a rear-mounted timing chain that costs £2,000–£3,500 to replace because the gearbox has to come out to access it. This one fact defines every F10 diesel purchase. Everything else is secondary.
- G30 (2017–present): Most reliable generation. B47 diesel is proven and free of the N47 chain issue.
- F10/F11 post-2012: N47 chain risk reduced after running changes. Still worth checking.
- F10/F11 pre-2012: N47 diesel — timing chain is the single most important check.
The N47 timing chain: the September 2011 cutoff date and what the DVSA record tells you
The N47 diesel engine fitted to pre-2012 F10 520d and 525d models has a rear-mounted timing chain — unusual because accessing it requires removing the gearbox. When the chain or guide wears, the repair is £2,000–£3,500 at an independent BMW specialist because of the labour involved. The cutoff date is approximately September 2011 — cars built after this used a revised chain and guide that significantly reduced the failure rate. For any pre-September 2011 F10 diesel, ask specifically about timing chain service history. If it hasn't been done and the car is approaching 80,000+ miles, either walk away or negotiate the cost into your price. An N47 with a failing chain will produce 'engine noise' or 'engine rattle' DVSA advisories when a tester hears it on the ramp during warm-up. Multiple engine-noise entries in the DVSA history on a pre-2012 F10 mean the chain has been audible and logged for two or more MOT cycles.
- Pre-September 2011 N47: High timing chain risk. Inspect or budget £2,000–£3,500 for preventive replacement.
- Post-September 2011 N47: Revised chain — still worth confirming, but significantly lower risk.
- B47 (G30 and some late F10): No N47 chain issue. Different and more reliable engine.
Adaptive suspension: expect £800–£1,500 per corner on any high-mileage F10
Many F10 and F11 cars were specified with adaptive suspension (EDC — Electronic Damper Control). The adaptive dampers are a known wear item — when they fail, the car feels crashy over bumps and the driver gets a warning light. Replacement is £800–£1,500 per corner at an independent BMW specialist, meaning a full set of four can cost £3,000–£5,000. This is not a reason to avoid an F10, but it is a major reason to check the suspension carefully at viewing. Bounce each corner — uneven rebound suggests a damper on the way out. Budget for this as a likely cost within 30,000 miles on any higher-mileage F10. Suspension-related DVSA advisories (strut, damper, excessive play) on higher-mileage F10s are an early signal of failing adaptive dampers.
F11 Touring: underpriced by £1,000–£2,500 versus the saloon and more practical
The F11 Touring (estate) is consistently priced lower than the F10 saloon in the used market — often £1,000–£2,500 cheaper at the same mileage and spec. It offers more boot space (560 litres versus 520 in the saloon), a more practical rear seat area, and the same powertrain options. Fleet buyers disproportionately chose the saloon, so there is a real pool of quality Touring stock. For everyday use, the Touring is the better car and the better buy.
G30 520d: the B47 engine resolves the N47 chain — this is the safer car to buy
The G30 520d uses the B47 2.0-litre diesel, which has none of the N47's chain issues and has built a strong reliability record. It is smooth, genuinely economical (50–55mpg on a run), and more than adequate for executive transport. The G30 also has a more sophisticated chassis and better standard tech than the F10. Main costs to watch are diesel injectors on higher-mileage examples and the brake service interval — BMW's long intervals mean pads and discs can wear unevenly on low-mileage cars.
What your budget buys on an F10, F11 or G30
At £8,000–£12,000 you are in F10 territory (2012–2015 cars with 80,000–120,000 miles). Pre-purchase inspection from a BMW specialist is essential — budget £120–£160. At £13,000–£20,000 you are in lower-mileage F10 facelift or early G30 territory. £21,000–£30,000 covers mid-mileage G30 cars with manufacturer service history.
The takeaway
The N47 chain is the F10's defining risk. The DVSA record shows whether it's already been audible on the ramp. A pre-September 2011 F10 with 'engine noise' advisories in the last two cycles is a car with a failing chain that's been noticed and noted. Check it before you travel — not after. Search BMW 5 Series on WheelsAI — every listing includes a free MOT history, tax and HPI check.
Frequently asked questions
Frequently asked questions
Is the BMW F10 5 Series reliable?
It can be, but it requires more due diligence than a Japanese equivalent. The N47 timing chain issue on pre-2012 cars is a genuine catastrophic failure risk. Post-2012 cars with confirmed chain history and no adaptive suspension issues are solid long-term propositions.
How much does it cost to maintain a BMW 5 Series?
More than average. An annual service at a BMW independent costs £250–£450. Major items like adaptive suspension dampers (£800–£1,500 per corner), injectors (£200–£400 each), and the N47 timing chain (£2,000–£3,500) mean budgeting for £1,000–£2,000 per year in unplanned costs is wise.
What is the best BMW 5 Series for fuel economy?
The 520d in both F10 and G30 form returns 45–55mpg in mixed driving. For higher mileage buyers it is the right choice. The 530d is faster and more comfortable but uses noticeably more fuel. Petrol versions are better for lower mileage but are more expensive at the pumps on long runs.
Is the BMW 5 Series F11 Touring worth buying?
Absolutely. It is frequently £1,000–£2,500 cheaper than the saloon at the same mileage and spec, offers more boot space, and shares the same mechanical package. Unless you specifically want the saloon's lower profile, the Touring is the better buy.
What should I check on a used BMW 5 Series test drive?
Start the engine from cold and listen for any rattle from the N47 chain. Drive slowly over speed bumps and note whether each corner absorbs them evenly — uneven rebound means a failing adaptive damper. On the motorway, listen for any vibration from the prop shaft or differential on four-wheel-drive models. Check all warning lights are clear on a warm engine.
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