"Is the 3 Serisi 330d reliable, and what should you check?"
When buying a used BMW 3 Series 330d 2009 (E90 / E91 / E92 / E93 / facelift), the most frequently mentioned issue is carbon buildup and swirl flap problems. Excessive oil consumption is also commonly reported.
Engine: N57
N57D30A · 330d · Used in this car from 2009-2020
Known engine issues
Swirl flapsCompared to the M57 diesel, the intake manifold flap system has been improved and they can no longer fall off and drop directly into the cylinders. However, they still get dirty and stick, so the intake needs cleaning every 100,000 km.
Timing chain stretchThe timing chains in this engine are quite durable and only stretch after 200,000 km, but their replacement is very complex and expensive because they are located on the flywheel side. Also, chain breaks occasionally occur due to tensioner failure.
Crankshaft damper pulleyAs in many diesel engines, a crankshaft damper pulley is used here, which is very expensive and often fails at 100,000–150,000 km. With pulley failure, the load on the crankshaft increases and it may crack.
+1 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
Carbon buildup and swirl flap problems
Often reported
The engine tends to form carbon deposits in the intake tract and on the swirl flaps, which can cause performance loss, abnormal engine response, and in worst cases, flap breakage sending debris into the intake system.
Engine Internal
Excessive oil consumption
Often reported
Many users of the N57 3.0 engine report increased oil consumption as mileage accumulates or after hard driving; in some cases, consumption can rise from acceptable to high within a few thousand kilometers.
Engine Internal
Diesel Particulate Filter (DPF) clogging
Often reported
Especially in city or short-distance driving, the DPF can clog frequently, leading to more frequent regenerations, warning lights, and power loss.
Exhaust Emissions
EGR cooler failure and coolant leak
Often reported
EGR cooler failure is reported on 3.0 diesel engines, causing coolant loss and white smoke from the exhaust.
Exhaust Emissions
Idle fluctuation and cold start issues
Often reported
Italian forum reports indicate idle fluctuation and rough running on the first start of the day, sometimes accompanied by codes related to fuel system components or glow plugs.
Fuel System
BMW 3 Serisi 330d technical specs
BMW 3 Serisi 330d (2009): boot 440 L; fuel use 5,7 l/100 km (urban 7,3 l/100 km · extra-urban 4,8 l/100 km); 0–100 in 6 s.
Boot capacity
440 L
Fuel consumption
5,7 l/100 km (urban 7,3 l/100 km · extra-urban 4,8 l/100 km)
What should I look for when buying a BMW 3 Series 330d?+
When buying a 2009 330d, check the service history, test drive, and look for engine/transmission warnings. The most commonly reported issues are: carbon buildup and swirl flap problems; excessive oil consumption; Diesel Particulate Filter (DPF) clogging.
What are the common problems of the BMW 3 Series 330d?+
The most frequently reported issues are: carbon buildup and swirl flap problems; excessive oil consumption; Diesel Particulate Filter (DPF) clogging.
Is the BMW 3 Series 330d reliable?+
Rather than a simple yes or no, it's best to weigh the proven pros and cons together. This page lists 5 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from the Difetti fault database; the source vehicle and target vehicle are matched by brand, fuel type, engine, and generation. Topics with insufficient evidence are not shown.