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Engine comparison

BMW B57
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BMW B57
Verdict
GOOD · 72/100
Est. cost /3yr
€1,200-3,000 over 3 years depending on EGR cooler and swirl flap condition at purchase
Oil interval
10,000 km
Recalls
1
Worst issue
EGR Cooler Leak / Failure
HIGH
BMW B57
G20 · G20
EGR Cooler Leak / Failure
€800-2,500
HIGH
Turbocharger Wastegate Actuator Rattle
€300-900
MODERATE
Swirl Flap Actuator Failure
€400-1,200
MODERATE
Glow Plug and Control Module Failure
€300-1,400
MODERATE
High-Pressure Fuel Pump (HPFP) Failure
€1,200-3,500
MODERATE
EGR / MAF Sensor Fouling
€100-400
LOW
BMW B57
G20 · G20
•Cold-start the engine and listen for turbo wastegate rattle at idle and light throttle before it warms up
•Scan the full fault memory with ISTA or an equivalent tool, specifically checking for EGR, glow plug, and fuel pressure related codes
•Check coolant level and look for any history of coolant loss without an external leak, a sign of EGR cooler leakage
•Request full service history and confirm oil changes have not exceeded 10,000 km intervals
•Run a swirl flap actuator test via diagnostics and check for carbon binding or sluggish response
•Ask whether glow plugs have ever been replaced and when, seized plugs that snap during removal are costly to extract
•Check for any HPFP related fault codes or history of fuel system work, and inspect the fuel filter for metal contamination if a pump issue is suspected
•Confirm the car has had regular longer drives allowing full DPF regeneration, cars used only for short urban trips are more prone to EGR and DPF fouling
BMW B57
G20 · G20
EGR Cooler
Inspect for leaks and verify any applicable recall/service-campaign remedy has been completed before purchase
60,000 km
Turbocharger Wastegate Actuator
Listen for rattle during deceleration and at low speed; inspect actuator linkage if noise is present
50,000-120,000 km
Swirl Flap Actuator
Test via diagnostics and inspect for carbon binding, replace if sluggish or non-responsive
80,000 km
Glow Plugs
Replace proactively before corrosion causes seizure, especially on high-mileage or cold-climate vehicles
100,000 km
High-Pressure Fuel Pump
Monitor for fuel pressure faults and unusual start behaviour; service fuel filter on schedule
120,000 km
BMW B57
G20 · G20
EGR Cooler
Potential EGR cooler leak which could lead to coolant loss or engine damage
BMW B57
G20 · G20
✓Robust cast-iron block shared across the B57 family, holds up well to high mileage when serviced on schedule
✓Strong low-end torque (620 Nm from around 1,500 rpm) makes it flexible and relaxed in daily driving
✓Front-mounted, chain-driven timing setup with no history of the rear-chain design flaw that plagued the older N47
✓Good real-world fuel economy for a 3.0L six, typically 6-7 l/100km in mixed driving
✓Wide diagnostic and parts support due to shared architecture with the broader B37/B47/B48/B58 modular engine family
BMW B57
G20 · G20
Real consumption
6.2 L/100km
Official consumption
Not available
Oil interval
10,000 km
Oil spec
BMW Longlife-04 5W-30 (e.g. Castrol Edge 5W-30 LL or Shell Helix Ultra 5W-30)
Est. cost /3yr
€1,200-3,000 over 3 years depending on EGR cooler and swirl flap condition at purchase
BMW B57
G20 · G20
265 hp · 620 Nm
2019-present
340 hp · 700 Nm
2019-present
The single-turbo B57D30O0 in the 330d and the twin-turbo B57D30T0 in the M340d share the same core block and bottom end, so neither tune is inherently less reliable than the other, the second turbo mainly adds complexity (an extra wastegate and actuator) rather than fragility. Buy based on documented service history and whether the EGR cooler, swirl flaps, and glow plugs have already been addressed, not on which power output is fitted.