B48 vs M54 — Reliability Comparison

Specifications

B48

M54

Brand

BMW

Verdict

BUY

BEST

Reliability

82

93

Years

2014--present

2000--2006

Displacement

1998 cc

2979 cc

Layout

I4

I6

Type

Petrol Turbo

Petrol Na

Power

184--255 hp

170--231 hp

Known Issues

3

4

Total Risk Cost

€650--€1,350

€530--€1,250

Character

B48

"B58s little brother. Efficient, smooth. Remap to 260hp safe. Best modern 4-cyl BMW."

M54

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

Issues Comparison

B48 3

● MODERATE

Coolant vent line failure €100--€250 40,000 km--100,000 km

● MODERATE

Oil filter housing gasket — early units (2014-2016) €250--€500 40,000 km--100,000 km

○ MINOR

Intake valve carbon buildup (DI) €300--€600 60,000 km--120,000 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

B48 40

6 Series G32 2017--2023 X3 G01 2017--2024 4 Series G22 2020--present Z4 G29 2019--present 2 Series Active Tourer U06 2022--present 4 Series F32 2016--2020 3 Series G20 2019--present GR Supra A90 2020--present 1 Series F20 2015--2019 5 Series G30 2017--2023 X2 F39 2018--2023 1 Series F40 2020--present 2 Series Active Tourer U06 2022--present X1 F48 2015--2022 2 Series F22 2016--2021 5 Series G30 2017--2023 3 Series F30 2015--2019 X4 G02 2018--present X3 G01 2017--2024 4 Series G22 2020--present 2 Series G42 2022--present 3 Series G20 2019--present Z4 G29 2019--present 3 Series F30 2015--2019 2 Series Active Tourer F45 2014--2021 5 Series G60 2023--present 1 Series F20 2015--2019 4 Series F32 2016--2020 2 Series Active Tourer U06 2022--present 5 Series G60 2023--present 5 Series G30 2017--2023 X3 G01 2020--2024 3 Series G20 2019--present 1 Series F40 2019--present 320i F30 LCI 2015--2019 Sedan 320i GT F34 2013--2016 Gran Tourer 320i Touring F31 2012--2019 Wagon 330i GT F34 2016--2019 Gran Tourer 330i Touring G21 2019--2024 Wagon 420i Gran Coupe F36 2014--2020 Gran Coupe

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