Generations
E39 — Fourth Generation
1995–2004
2.2i, 2.5i, 2.8i, M5 V8, 2.5d, 3.0d
E60 — Fifth Generation
2003–2010
530i, 535i Twin Turbo, M5 V10, 520d, 530d
F10 — Sixth Generation
2010–2017
520i Turbo, 528i, 535i, M5 V8, 520d, 530d/535d
G30 — Seventh Generation
2017–2023
520i, 530i/540i, M5 Competition, 520d, 530d/540d, 530e
Top issues to watch for
The most serious BMW 5 Series problems ranked by severity. We track 23 known issues — here are the ones you need to know about first.
The S85 5.0-litre V10 engine suffers from premature rod bearing failure, typically between 30,000-80,000 miles. The bearing clearances are tight and highly sensitive to oil viscosity and service intervals. When bearings fail, metal debris circulates through the oil system destroying the entire engine beyond economical repair. This is the single most catastrophic and expensive failure mode on the E60 M5, with total rebuild costs routinely exceeding the vehicle's market value.
What happens if ignoredComplete bearing failure destroys the engine requiring a full rebuild costing £8,000-£15,000 or replacement with a used/remanufactured unit. Metal debris contaminates the oil system requiring complete system flushing. The vehicle is unsafe to drive once bearing knock is present as catastrophic failure can occur without warning.
Main dealer
£12,000–£20,000
The N47 diesel engine has a rear-mounted timing chain that is prone to stretching and complete failure, typically between 40,000-100,000 miles. Unlike front-mounted chains, the N47 chain requires complete engine removal for replacement, making this one of the most expensive non-catastrophic failures possible. Chain failure results in valve damage as this is an interference engine. The issue affects all N47 variants and is considered the primary reliability concern for F10 520d models.
What happens if ignoredComplete chain failure destroys valves and potentially pistons requiring engine rebuild or replacement. Replacement costs £2,000-£4,000 due to engine removal requirement. Chain stretch before failure causes progressive power loss and increased fuel consumption. Vehicle should not be driven if chain rattling is heard.
Independent garage
£2,000–£3,000
The N20 four-cylinder turbo engine suffers from timing chain guide disintegration, typically between 40,000-100,000 miles. The plastic chain guides break apart allowing the chain to jump timing or snap completely. This is considered the most serious reliability issue on N20-powered F10 models including 520i and 528i variants. When the guides fail, metal and plastic debris circulates through the oil system potentially causing secondary damage to oil pumps and bearings.
What happens if ignoredGuide failure allows timing chain to jump or break causing valve damage on this interference engine. Repair requires engine disassembly costing £1,500-£3,500. Plastic debris can damage oil system components. Vehicle should not be driven if chain rattling is present due to risk of catastrophic failure.
Independent garage
£1,500–£2,500
The M57 diesel engine has plastic swirl flaps in the intake manifold that can break off and be ingested by the engine, causing catastrophic internal damage. The flaps are designed to improve combustion at low RPM but the plastic becomes brittle with age and heat cycling. When a flap breaks free, it can damage pistons, valves, and cylinder walls requiring complete engine rebuild. Many specialist BMW technicians recommend prophylactic swirl flap removal to prevent this failure mode.
What happens if ignoredIf a swirl flap breaks off and is ingested, it can cause catastrophic engine damage requiring complete rebuild costing £4,000-£8,000. Many owners elect for preventative removal costing £400-£800. Removal may slightly affect idle quality but eliminates the failure risk entirely. Driving with damaged flaps is extremely dangerous.
Independent garage
£400–£800
19 more known issues tracked
Including further major faults, wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a BMW 5 Series →
MOT failure hotspots
Based on DVSA MOT test data. These are the items where the BMW 5 Series fails at a significantly higher rate than the average car.
Transmission shaft flexible coupling deteriorated
Bodywork · 0-20k miles
MOT failure rate: 86x the fleet average
Sample: 3,540 tests
Any fracture or welding defect on a wheel
Wheels · 0-20k miles
MOT failure rate: 75x the fleet average
Sample: 1,989 tests
Fluid leak
Suspension · 100-120k miles
MOT failure rate: 49x the fleet average
Sample: 7,816 tests
Headlight fault
Lights & Electrics · 150k+ miles
MOT failure rate: 31x the fleet average
Sample: 11,370 tests
Window tint too dark
Wipers & Windscreen · 20-40k miles
MOT failure rate: 15x the fleet average
Sample: 12,909 tests
Tyre has a lump, bulge or tear caused by separa...
Tyres · 0-20k miles
MOT failure rate: 15x the fleet average
Sample: 1,284 tests
Technical service bulletins & recalls
Official manufacturer notices issued to dealerships. If a car hasn't had recall work done, it needs doing — check with the dealer network.
SI B11 06 07
N52 Engine Oil Cooler Gasket Leakage
Oil cooler gasket leak onto exhaust manifold. Replace gasket and clean oil residue from exhaust components.
E60 · N52B30 · Issued: 2007-03
SI B13 31 10
N54 High Pressure Fuel Pump Replacement Procedure
HPFP failure causing long cranking and hesitation. Check pump index number - higher numbers indicate updated components with improved reliability.
E60, F10 · N54B30 · Issued: 2010-11
Buying a BMW 5 Series?
Check a specific car's service history to see if it's been looked after — franchised dealer records with dates, mileage, and work done.
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BMW 5 Series reliability FAQs
What are the most common problems with the BMW 5 Series?
The BMW 5 Series has 23 known issues across 4 severity levels. The most serious are: Rod bearing failure (engine destroyer) (E60), Timing chain failure (F10), Timing chain guide failure (F10).
Is the BMW 5 Series reliable?
The BMW 5 Series has 7 dangerous and 9 major known issues. This is a higher number than average — careful pre-purchase inspection is essential.
How much does it cost to fix BMW 5 Series problems?
Costs vary by issue. Independent garages are typically 30-50% cheaper than main dealers for most repairs.
Which BMW 5 Series generation is most reliable?
The E39 (1995–2004) has the fewest dangerous issues (1). However, condition and service history matter more than generation — a well-maintained earlier car can be more reliable than a neglected newer one.