"Is the E Serisi E350d reliable, and what should you check?"
The most frequently mentioned issues when buying a used Mercedes-Benz E-Class E350d 2018 (213/238): Engine oil leaks and intake swirl flap failures. Also, NOx sensors and start lock are commonly reported.
Engines available in this year
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
Engine oil leaks and intake swirl flap failures
Often reported
The 3.0 V6 OM642 engine is known for oil leaks due to degraded gaskets/oil coolers in the 'valley' of the V and intake swirl flap failures due to carbon buildup from the EGR. Both issues can cause performance problems and require labor-intensive repairs.
Engine Internal
NOx sensors and start lock
Often reported
NOx sensors on the OM642 engine fail with moderate frequency, causing the ECU to enter protection mode and trigger emission-related counters/emergencies, potentially limiting the number of remaining starts until the vehicle stops.
Exhaust Emissions
Injectors and leaks/sealing ('black death')
Often reported
Reported to leak from injectors or seals, causing black deposits around the cylinder head, black smoke from the exhaust, and rough engine running.
Fuel System
Turbocharger and actuator issues
Often reported
The turbocharger and VNT actuators/valves can fail due to oil contamination, particulate buildup, or wear, leading to power loss, exhaust smoke, and unusual noises.
What should I look for when buying a Mercedes-Benz E-Class E350d?+
When buying a 2018 E350d, check the service history, test drive, and engine/transmission warnings. Most commonly reported issues: engine oil leaks and intake swirl flap failures; NOx sensors and start lock; injectors and leaks/sealing ('black death').
What are the chronic problems of the Mercedes-Benz E-Class E350d?+
Most commonly reported issues: engine oil leaks and intake swirl flap failures; NOx sensors and start lock; injectors and leaks/sealing ('black death').
Is the Mercedes-Benz E-Class E350d reliable?+
Rather than a simple yes/no, it's best to weigh 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 Difetti fault database records; brand, fuel, engine, and generation compatibility between source and target vehicle is verified. Topics with insufficient evidence are not shown.
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.
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