535i / xDrive35i 3.0 Turbo (N55)
2010–2016 · petrol · 2979cc · 306hp
Engine codes: N55B30
Reliability, common problems and owner reviews for the Bmw 5 Series F10 535i / xDrive35i 3.0 Turbo (N55). Check this before you buy used.
The 306 hp N55 single twin-scroll turbo six (F10 535i 2010–2016, F15 X5 35i 2013–2018) replaced the troubled N54 and is far more dependable: no failing twin turbos, fewer fuel-pump and injector problems. What it does need is predictable money — the electric water pump and thermostat, the oil filter housing and valve cover gaskets (an oil-soaked belt is a real engine risk) and the occasional charge pipe or wastegate rattle. Serviced on time it is a strong long-term engine.
Same engine, other cars
This is the same physical engine (N55B30) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
The N55's electric water pump fails with little warning (coolant warning, reduced power, overheating); the thermostat is usually replaced with it.
Fix / Workaround: Replace pump and thermostat together preventively around 110,000–150,000 km, or at the first coolant-temperature warning.
Repair cost: €700–€1200
Typically appears after: 110,000 km
The oil filter housing gasket leaks onto the auxiliary belt; an oil-soaked belt can be shredded and pulled behind the crank pulley into the front seal. The plastic valve cover (with integrated breather) cracks or its gasket leaks onto the exhaust.
Fix / Workaround: Replace the oil filter housing gasket early and check the belt; a cracked valve cover is replaced as an assembly.
Repair cost: €250–€800
Typically appears after: 100,000 km
Wastegate linkage rattle on cold start/overrun; the plastic charge pipe cracks (sudden loss of boost); injectors and the high-pressure pump can fail, though far less often than on the N54.
Fix / Workaround: Wastegate rattle is mostly noise; replace a cracked charge pipe with an aluminium one; injectors to the latest index only when they leak.
Repair cost: €200–€1200
Typically appears after: 120,000 km
Mileage Thresholds
After 110,000 km: Water pump/thermostat and oil filter housing gasket window.
Pre-Purchase Checklist
- ☐Scan for coolant-pump and thermostat faults
- ☐Look under the engine for oil at the filter housing and on the belt
- ☐Cold-start: wastegate rattle vs. chain/valvetrain noise
- ☐ZF 8HP: gearbox oil/filter service history; xDrive: transfer-case actuator faults
Frequently asked questions
Is the Bmw 5 Series F10 535i / xDrive35i 3.0 Turbo (N55) reliable?
Maint. Sensitive — The 306 hp N55 single twin-scroll turbo six (F10 535i 2010–2016, F15 X5 35i 2013–2018) replaced the troubled N54 and is far more dependable: no failing twin turbos, fewer fuel-pump and injector problems. What it does need is predictable money — the electric water pump and thermostat, the oil filter housing and valve cover gaskets (an oil-soaked belt is a real engine risk) and the occasional charge pipe or wastegate rattle. Serviced on time it is a strong long-term engine.
What are the common problems and reviews for the Bmw 5 Series F10 535i / xDrive35i 3.0 Turbo (N55)?
The most commonly reported problems: Electric water pump and thermostat, Oil filter housing and valve cover gaskets, Wastegate rattle, charge pipe and injectors.
Is a used Bmw 5 Series F10 535i / xDrive35i 3.0 Turbo (N55) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.