EngineCreep
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BMW N54
vs B58

N54 48/100 · B58 87–91/100

On our scores the BMW B58 is the safer buy: 87–91/100 against 48/100 for the BMW N54.

Version by version

BMW N54

  1. BMW N54 in the 335i E90 LCI2009–2010

    48/100Risky

    14 confirmed issues

    Best-known problemHigh-pressure fuel pump failure · from 129k km · €800–2,000

BMW B58

  1. BMW B58 in the M340i G202019–2025

    91/100Excellent

    12 confirmed issues

    Best-known problemOil pump failure · from 85k km · €1,500–4,000

  2. BMW B58 in the 340i F302016–2019

    87/100Excellent

    12 confirmed issues

    Best-known problemHigh-pressure fuel pump failure · from 161k km · €800–2,000

  3. BMW B58 in the M140i F20 LCI2016–2019

    87/100Excellent

    12 confirmed issues

    Best-known problemOil pump wear / sludge buildup · from 85k km · €1,500–4,000

The problems they share

Reported on both

  • High-pressure fuel pump failure
  • Oil pump wear / sludge buildup
  • Rod bearing failure
  • Water pump failure
  • Head gasket failure
  • Oil leak from seals or gaskets
  • Fuel injector failure
  • Wastegate / boost actuator failure
  • Variable valve timing solenoid/actuator failure
  • Dual-mass flywheel / clutch wear

Only on the BMW N54

  • Turbocharger failure
  • ECU fault or wiring issue
  • Thermostat / temperature sensor failure
  • Intake valve carbon buildup

Only on the BMW B58

  • Oil pump failure
  • Piston ringland failure
  • Intercooler failure or leak
  • Engine sensor failure

A problem missing from a version may be rarer there, or have fewer owner reports behind it so far.

Head to head