"Is the 6 Serisi 640d reliable, and what should you check?"
When buying a used BMW 6 Series 640d 2012 (F06 / F12 / F13), the most frequently mentioned issue is timing chain and tensioner wear. Additionally, DPF regeneration problems and oil dilution are also commonly reported.
Engine: N57
N57D30B · 640d · Used in this car from 2011-2018
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.
Timing chain and tensioner wear
Often reported
On the 640d's 3.0 N57 engine, as mileage increases, the timing chain, guides, and tensioner may experience stretching/wear
Timing chain
DPF regeneration problems and oil dilution
Often reported
The N57 diesel engine may experience incomplete DPF regenerations, especially in short-distance city driving. Failed regenerations can clog the particulate filter, trigger warning lights, and increase fuel consumption
Exhaust Emissions
EGR valve and carbon buildup
Often reported
The EGR valve and intake air ports are prone to carbon buildup in turbo diesel engines; this can cause rough running, power loss, smoke, and the check engine light to come on
Exhaust Emissions
Turbo/actuator issues
Often reported
User reports indicate faults or malfunctions in turbocharger system components (turbine and wastegate actuators) on high-performance diesel engines: loss of boost pressure, stuck actuator, or faulty boost pressure sensor leading to power loss and check engine light
Turbo
BMW 6 Serisi 640d technical specs
BMW 6 Serisi 640d (2012): boot 460 L; fuel use 5,8 l/100 km (urban 7,1 l/100 km · extra-urban 5,1 l/100 km); 0–100 in 5.2 s.
Boot capacity
460 L
Fuel consumption
5,8 l/100 km (urban 7,1 l/100 km · extra-urban 5,1 l/100 km)
What should I look for when buying a BMW 6 Series 640d?+
When buying a 2012 640d, check the service history, test drive, and look for engine/transmission warnings. The most commonly reported issues: timing chain and tensioner wear; DPF regeneration problems and oil dilution; EGR valve and carbon buildup.
What are the common problems of the BMW 6 Series 640d?+
The most frequently reported issues: timing chain and tensioner wear; DPF regeneration problems and oil dilution; EGR valve and carbon buildup.
Is the BMW 6 Series 640d reliable?+
Rather than a simple yes/no, it's important to evaluate the proven pros and cons together. This page lists 4 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 verified for brand, fuel, engine, and generation compatibility. Topics with insufficient evidence are not shown.