B38 vs M54

Side-by-side reliability comparison

Higher reliability score
M54 BEST 93/100
+21 points over B38
0 / 100
ACCEPTABLE B38 BMW
0 / 100
BEST M54 BMW

Specifications

B38
M54
Brand
BMW
BMW
Verdict
ACCEPTABLE
BEST
Reliability
72
93
Years
2014--present
2000--2006
Displacement
1499 cc
2979 cc
Layout
I3
I6
Type
Petrol Turbo
Petrol Na
Power
109--136 hp
170--231 hp
Known Issues
3
4
Total Risk Cost
€850--€1,900
€530--€1,250

Character

B38

"Budget modern BMW. Reliable but not exciting. 136hp adequate for city. Limited tuning."

M54

"Peak old-school BMW. Raspy, high-revving, raw. The benchmark. 300k+ km routine."

Issues Comparison

B38 3

● MODERATE
Timing chain wear (rare — oil dependent) €600--€1,200 120,000 km--180,000 km
○ MINOR
Intake valve carbon buildup (DI) €250--€500 80,000 km--150,000 km
○ MINOR
Wastegate rattle (cold start) €0--€200 30,000 km--∞

M54 4

● MODERATE
Cooling plastics — water pump impeller critical €200--€450 80,000 km--150,000 km
● MODERATE
DISA valve failure (intake manifold flap) €80--€200 80,000 km--160,000 km
● MODERATE
Double VANOS oil seal wear €150--€350 100,000 km--180,000 km
○ MINOR
Valve cover gasket oil leak €100--€250 100,000 km--200,000 km

Models

B38 15

2 Series Active Tourer F45 2014--2021 1 Series F40 2019--2024 3 Series G20 2019--present 1 Series F20 2015--2019 1 Series F40 2019--2024 X1 F48 2015--2022 2 Series Active Tourer U06 2022--present 1 Series F20 2015--2019 3 Series F30 2015--2019 X1 F48 2020--2022 2 Series Active Tourer U06 2022--present i8 I12 2014--2020 116i F20 LCI 2015--2019 Hatchback 118i F20 LCI 2015--2019 Hatchback 318i F30 LCI 2015--2019 Sedan

M54 13

5 Series E39 2000--2003 3 Series E46 2001--2005 5 Series E60 2003--2007 5 Series E60 2003--2005 5 Series E39 2000--2003 Z4 E85 2003--2005 3 Series E46 2001--2005 5 Series E60 2003--2005 X5 E53 2000--2006 5 Series E39 2000--2003 Z4 E85 2003--2005 3 Series E46 2001--2005 Z3 E36/7 2000--2002
Full B38 Report Full M54 Report