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M54B30

M54B30, 3.0 litres (228-235 hp) engine: faults and reliability

BMW M54 (M54B22/M54B25/M54B30) version

With caution

A long-lived engine if maintained, but expect to renew the cooling system and the CCV if there are no invoices.[1][2][3]

Years
2000–2006
Power
231–235 hp
Faults that affect it
5
2 of high or critical severity
Cars that use it
6
in our database

5 sourcesHow we work

What changes in this version

Largest version: 170 kW with 300 N·m at 3,500 rpm; the ZHP variant reaches 235 hp and 6,800 rpm.[4][5]

Engine codes of this version: M54B30.

Faults of the M54B30 engine

The documented engine faults that affect this version and its years, from most to least important.

  1. 1High severityFrequency: CommonCoolingThermostat and water pump failureThe M54's thermostat, housing and water pump contain plastics that become brittle and fail. If left unattended, overheating can warp the aluminium cylinder head. It is advisable to replace them together.Appears at around 129,000 km
  2. 2High severityFrequency: CommonCoolingCracked expansion tank and coolant leakThe plastic expansion tank degrades over the years and eventually cracks. It is cheap compared with the cost of overheating an M52/M54, and age matters more than mileage.
  3. 3Medium severityFrequency: CommonLubricationCracked crankcase ventilation valve (CCV) and oil consumptionThe M54's CCV valve (oil separator) is made of plastic and cracks with age: oil then gets into the intake, consumption rises and a rough idle and smoke appear. It is the engine's most frequently cited weak point.Appears at around 96,000 km
  4. 4Medium severityFrequency: CommonLubricationOil leak from the valve cover gasketThe M54's valve cover is made of plastic and, over the years, warps and stops sealing: oil leaks, a burning smell, oily spark plugs and misfires appear. It is replaced together with the gasket.
  5. 5Medium severityFrequency: OccasionalOtherWorn VANOS O-ringsThe seals in the VANOS (variable valve timing) system harden with heat and synthetic oil: the engine loses power below 3,000 rpm and the idle becomes rough. It is fixed with a seal kit.Appears at around 129,000 km

Cars fitted with the M54B30 engine

Open each car to see all its faults with this engine and what to check before buying it.

BMW

Frequently asked questions

Is the M54B30 engine reliable?

Our verdict is “With caution”. A long-lived engine if maintained, but expect to renew the cooling system and the CCV if there are no invoices.[1][2][3]

What faults does the M54B30 engine have?

The documented ones that affect this version, by importance: thermostat and water pump failure (high severity), cracked expansion tank and coolant leak (high severity), cracked crankcase ventilation valve (CCV) and oil consumption (medium severity), oil leak from the valve cover gasket (medium severity) and worn VANOS O-rings (medium severity).

Which cars use the M54B30 engine?

BMW Serie 3 E46 (2000–2006), BMW Serie 5 E39 (2000–2004), BMW Serie 5 E60 (2003–2005), BMW X3 E83 (2003–2006), BMW X5 E53 (2000–2006) and BMW Z4 E85/E86 (2002–2006).[4][5]

Are you buying a car with the M54B30 engine?

We will put you in touch with a partner only if you authorise it in the form.

Do you have a car with this engine? Tell us which faults you have had and at how many kilometres. Report your fault.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. BMW M54 Engine Guide: Reliability, Common Problems & Tuning PotentialEuro Premium Parts · Technical documentation · consulted 5 October 2026
  2. Il motore da 6 cilindri che supera agilmente i 300.000 kmAutoblog.it · Motoring press · published 13 February 2026 · consulted 5 October 2026 · in Italian
  3. BMW M54 reliabilityAutoscore · Other source · consulted 5 October 2026
  4. BMW M54Wikipedia (inglés) · Other source · consulted 5 October 2026
  5. BMW M54Wikipedia (alemán) · Other source · consulted 5 October 2026 · in German