E280 / E320 CDI 3.0 V6 (OM642)
2008–2015 · diesel · 2987cc · 224hp
Engine codes: OM642
Reliability, common problems and owner reviews for the Mercedes Benz GLK E280 / E320 CDI 3.0 V6 (OM642). Check this before you buy used.
The 3.0 V6 CDI (OM642) is the volume ML engine and the one to buy — torquey, refined and well-matched to the big SUV, the same robust six used across C/E-Class, S-Class and the Jeep Grand Cherokee. Two signature niggles to budget for: the oil-cooler seals between the V harden and leak oil (common, labour-involved), and the intake swirl-flap/manifold assembly (the 'Drallklappen' actuator) fails. Plus EGR/DPF and high-mileage injection. With those addressed and good history it's a dependable long-hauler.
Same engine, other cars
This is the same physical engine (OM642) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
Oil cooler seals leak oil over the engine — labour-intensive (intake off).
Fix / Workaround: Replace oil cooler seals with updated parts.
Repair cost: €500–€1200
Typically appears after: 120,000 km
Frequent injector failures on the OM642.
Fix / Workaround: Replace failed injectors (expensive).
Repair cost: €400–€1600
Typically appears after: 130,000 km
Intake swirl motor/runners fail → limp mode.
Fix / Workaround: Replace swirl motor / intake.
Repair cost: €300–€900
Oil-cooler seals (in the V, under the intake) harden and leak oil — common OM642 job, labour-heavy.
Fix / Workaround: Replace oil-cooler seals (intake off).
Repair cost: €400–€1100
Typically appears after: 130,000 km
Swirl-flap actuator/manifold ('Drallklappen') fails → limp/fault; can shed parts.
Fix / Workaround: Replace/repair intake manifold + actuator.
Repair cost: €300–€1000
Typically appears after: 140,000 km
EGR, DPF and injectors at higher mileage.
Fix / Workaround: Service EGR; motorway regens; injector test.
Repair cost: €250–€1400
Intake manifold swirl flaps/linkage wear and can be ingested.
Fix / Workaround: Replace/delete intake runner assembly.
Repair cost: €300–€900
Swirl-flap actuator, EGR and DPF items with age/short trips.
Fix / Workaround: Repair intake; service EGR; motorway regens.
Repair cost: €300–€1200
Mileage Thresholds
After 130,000 km: Oil cooler / injector / swirl issues cluster.
After 200,000 km: Oil-cooler + swirl-flap territory.
After 150,000 km: Oil cooler / intake attention typically due.
Pre-Purchase Checklist
- ☐Inspect for oil cooler leak
- ☐Scan for injector codes
- ☐Check swirl motor / limp mode
- ☐Budget for known repairs
- ☐Oil-cooler seal leak history
- ☐Swirl-flap/intake manifold history
- ☐The engine to buy — shared robust V6
- ☐Inspect for oil cooler seal leaks
- ☐Ask about intake swirl flap/runner condition
- ☐Strong engine once these are done
- ☐Oil-cooler seal history
- ☐Swirl-flap/EGR history
- ☐The pick of the range — shared robust V6
- ☐Effortless — shared robust V6
Frequently asked questions
Is the Mercedes Benz GLK E280 / E320 CDI 3.0 V6 (OM642) reliable?
Maint. Sensitive — The 3.0 V6 CDI (OM642) is the volume ML engine and the one to buy — torquey, refined and well-matched to the big SUV, the same robust six used across C/E-Class, S-Class and the Jeep Grand Cherokee. Two signature niggles to budget for: the oil-cooler seals between the V harden and leak oil (common, labour-involved), and the intake swirl-flap/manifold assembly (the 'Drallklappen' actuator) fails. Plus EGR/DPF and high-mileage injection. With those addressed and good history it's a dependable long-hauler.
What are the common problems and reviews for the Mercedes Benz GLK E280 / E320 CDI 3.0 V6 (OM642)?
The most commonly reported problems: Oil cooler seal leak, Injector failure, Swirl motor / intake runner, Oil-cooler seal leak, Intake swirl-flap / manifold, EGR / DPF / injectors, Intake swirl flap / runner wear, Intake swirl-flap / EGR / DPF.
Is a used Mercedes Benz GLK E280 / E320 CDI 3.0 V6 (OM642) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.