BMW N52 engine report, 328i E90
BMW N52 · 328i (E90)
3.0 LPetrolInline-62006–2012
74/100
Checked by hand
[good]
A tough straight-six, once the recalls and cooling are sorted
Worth buying, but only on the right car. Proof that the NHTSA recalls for the VANOS bolts and the PCV heater have been carried out, and records showing the electric water pump, thermostat and oil filter housing gasket have been replaced.
ExcellentGoodSolidRiskyAvoid
- Known issues
- 15
- Critical
- 5
- Sources
- 113
Verdict
Worth buying, with money set aside for the age-related jobs.
Oil leaks from seals and gaskets, the water pump, the thermostat and the VANOS solenoids are the common ones, so check for all of them before you buy. On cars built from 2009 to 2011, make sure the VANOS bolt recall has been done, because a sheared bolt can wreck the engine. Oil consumption and oil pump wear are less frequent but more serious, which is why the service history matters. Head gasket and ringland failures are rare, and a car showing any sign of them is one to walk away from.
Specs
- Displacement
- 3.0 L
- Layout
- Inline-6
- Fuel
- Petrol
- Production
- 2004–2015
- Chassis
- E90
- Generation
- E90 NA
- Fitted
- 2006–2012
Known issues
15 confirmed · sorted by severity
CriticalVANOS bolt failure
The bolts that hold the VANOS unit to the cylinder head can work loose or snap. The engine then runs rough, loses power and may not restart, and broken bolts left in place can do serious damage. BMW recalled affected cars to fit revised bolts, so check that the recall work has been done.
Symptoms
- Warning Light
- Reduced Power Mode
- Rough Idle
- Knocking Noise
How often
Occasional · Manufacturing defect. Can destroy the engine if ignored. Not safely drivable.
Evidence
1 owner report backs this, confidence 95/100.
CriticalCrankcase vent heater short
A small heater keeps the crankcase ventilation line from freezing. Its element or connector can short and overheat, and at worst start a fire in the engine bay. BMW recalled affected cars for a redesigned heater and wiring, so check that the recall work has been done.
Symptoms
- Smoke (White/Blue/Black)
- Warning Light
How often
Rare · Manufacturing defect. Can destroy the engine if ignored. Not safely drivable.
Evidence
1 owner report backs this, confidence 95/100.
CriticalHead gasket failure
Head gasket failure, often preceded by overheating; can lead to a warped head or cracked block if not addressed.
Symptoms
- Coolant Loss
- Smoke (White/Blue/Black)
- Warning Light
How often
Rare · Design weakness. Does not normally destroy the engine. Not safely drivable.
CriticalOil pump wear / sludge buildup
Oil pump wear or sludge accumulation (often from extended oil-change intervals) reducing oil pressure and lubrication.
Symptoms
- Warning Light
- Knocking Noise
How often
Rare · Design weakness. Does not normally destroy the engine. Not safely drivable.
CriticalPiston ringland failure
Piston ringland cracking under high cylinder pressure/heat, common on tuned forced-induction engines.
Symptoms
- Power Loss
- Smoke (White/Blue/Black)
- Misfire
How often
Very rare · Design weakness. Can destroy the engine if ignored. Not safely drivable.
ModerateWater pump failure
Water pump seal or bearing failure (mechanical or electric pump), causing coolant loss.
Symptoms
- Coolant Loss
- Warning Light
How often
Common · Design weakness. Does not normally destroy the engine. Still drivable.
ModerateExcessive oil consumption
Worn valve stem seals, piston rings, or a clogged PCV/oil separator system causing oil consumption above manufacturer spec.
Symptoms
- Oil Consumption
- Smoke (White/Blue/Black)
How often
Rare · Design weakness. Does not normally destroy the engine. Still drivable.
ModerateHead bolt stretch
Head bolts stretch beyond spec (often single-use bolts reused incorrectly during service), risking head gasket failure.
Symptoms
- Coolant Loss
- Warning Light
How often
Rare · Design weakness. Does not normally destroy the engine. Still drivable.
ModerateDual-mass flywheel / clutch wear
Dual-mass flywheel wear causing rattle/vibration, often coinciding with clutch replacement interval.
Symptoms
- Excessive Vibration
- Knocking Noise
How often
Very rare · Expected maintenance. Does not normally destroy the engine. Still drivable.
LowVariable valve timing solenoid/actuator failure
VANOS/VTEC/VVT-style variable valve timing solenoids or actuators fail or clog, causing rough idle, rattle on start, or reduced power.
Symptoms
- Rough Idle
- Reduced Power Mode
- Warning Light
How often
Very common · Design weakness. Does not normally destroy the engine. Still drivable.
LowOil leak from seals or gaskets
Valve cover gasket, rear main seal, or front main seal degradation causing external oil leaks.
Symptoms
- Oil Consumption
How often
Common · Design weakness. Does not normally destroy the engine. Still drivable.
Evidence
38 owner reports back this, confidence 65/100.
LowThermostat / temperature sensor failure
Thermostat sticking open or closed, or temperature sensor drift, causing incorrect operating temperature.
Symptoms
- Warning Light
How often
Common · Age-related wear. Does not normally destroy the engine. Still drivable.
LowEngine sensor failure
Crankshaft, camshaft, MAP, lambda/O2, or MAF sensor failure causing rough running, stalling, or incorrect fueling.
Symptoms
- Warning Light
- Rough Idle
- Misfire
How often
Occasional · Age-related wear. Does not normally destroy the engine. Still drivable.
LowFuel injector failure
Injector wear, sticking, or seal failure causing misfires, rough running, or fuel leaks.
Symptoms
- Misfire
- Rough Idle
- Fuel Smell
How often
Very rare · Age-related wear. Does not normally destroy the engine. Still drivable.
LowECU fault or wiring issue
ECU hardware fault or injector wiring loom degradation causing misfires or no-start conditions.
Symptoms
- Warning Light
- Misfire
How often
Very rare · Manufacturing defect. Does not normally destroy the engine. Still drivable.
- Critical
- High
- Moderate
- Low
Water pump failurefrom 232k km
Oil pump wear / sludge buildupfrom 147k km
Variable valve timing solenoid/actuator failurefrom 175k km
Oil leak from seals or gasketsfrom 172k km
Thermostat / temperature sensor failurefrom 161k km
Engine sensor failurefrom 161k km
Check the car you're looking at
Set the mileage of the car you're looking at. Problems owners say start before it are the ones to ask the seller about; the next ones are what to budget for.
km
0 already past · 0 coming up
Already past: ask for proof
Nothing owners report starts before this mileage.
The next 30k km
Nothing owners report starts in this stretch.
Further on Water pump failure, Oil pump wear / sludge buildup, Variable valve timing solenoid/actuator failure, Oil leak from seals or gaskets, Thermostat / temperature sensor failure, Engine sensor failure
No reliable mileage VANOS bolt failure, Crankcase vent heater short, Head gasket failure, Excessive oil consumption, Piston ringland failure, Head bolt stretch, Dual-mass flywheel / clutch wear, Fuel injector failure, ECU fault or wiring issue
Too few owners said at what mileage these start, so they are not placed above.
Buying checklist
BMW N52 (328i E90) · Buying checklist
Sources
Updated 15 Sept 2026 · scoring v2.7
Behind this report sit 113 owner posts, forum threads and official records. Nothing gets on the list on one person's word. It takes a recall, or owners on separate platforms describing the same fault. The score then sets how often a problem turns up against the damage it does.