M54 vs B57
Side-by-side reliability comparison
Higher reliability score
M54
BEST
86/100
+4 points over B57
0
/ 100
BEST
M54
BMW
0
/ 100
BUY
B57
BMW
Specifications
M54
B57
Brand
BMW
BMW
Verdict
BEST
BUY
Reliability
86
82
Years
2000--2006
2015--present
Displacement
2979 cc
2993 cc
Layout
I6
I6
Type
Petrol Na
Diesel
Power
170--231 hp
265--400 hp
Known Issues
6
3
Total Risk Cost
€300--€700
€700--€1,400
Character
M54
"The last of the simple BMW straight-sixes: smooth, linear and very long-lived (around 330,000 km with proper care). Nothing on it is known to destroy the engine; the bills are age-related plastics and seals - crankcase ventilation, cooling system, DISA flap, VANOS seals and oil leaks."
B57
"Smooth, torquey straight-six diesel in single-, twin- and (until 2020) quad-turbo form. Strong long-distance record. The one official problem is the EGR-cooler fire recall, which in the US/Canada hit the 2018 540d twice - check recall status by VIN. Needs long runs to keep the DPF and intake clean."
Issues Comparison
M54 6
● MODERATE
Cooling system plastics — water pump, thermostat, expansion tank
● MODERATE
DISA valve failure (intake manifold flap)
● MODERATE
Double VANOS — solenoid and seal wear
● MODERATE
Crankcase ventilation (CCV) valve and hoses — oil consumption, false air
○ MINOR
Oil leaks — valve cover, oil filter housing and oil pan gaskets
○ MINOR
Camshaft / crankshaft position sensor failure — stalling, rpm hunting
B57 3
◆ CRITICAL
EGR cooler coolant leak — intake manifold melt, fire risk (recall)
● MODERATE
Intake manifold, swirl flap and EGR valve carbon build-up
● MODERATE
DPF loading on short trips