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B58B30M2

B58TU2 381 hp (B58B30M2, since 2022) engine: faults and reliability

BMW B58 3.0 de seis cilindros en línea turbo (B58B30) version

Buy

The documented failures relate to the first series and to units built before 2021; we have found no faults specific to the TU2, although it has only been on the road for a few years and there is little real-world experience.[1][2]

Years
since 2022
Power
381 hp
Faults that affect it
3
0 of high or critical severity
Cars that use it
6
in our database

6 sourcesHow we work

What changes in this version

Second update (2022): Miller cycle, electric VANOS and low-pressure indirect injection added to the direct injection; 381 hp (280 kW) and 520 N·m. German Wikipedia lists the M340i, M440i and M240i xDrive with this version as 48 V mild hybrids.[3][4]

Engine codes of this version: B58B30M2.

Faults of the B58B30M2 engine

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

  1. 1Medium severityFrequency: CommonLubricationOil leak from the valve cover gasketThe rubber gasket on the B58's valve cover hardens with heat cycles and eventually leaks oil: a burning smell, smoke near the cover and oil on the spark plugs. Guides place it between 60,000 and 100,000 miles (97,000-161,000 km).Appears at around 97,000 km
  2. 2Medium severityFrequency: OccasionalCoolingCoolant loss from the cap or the expansion tankCoolant loss is one of the most repeated problems in B58 guides. Workshops first suspect the expansion tank cap and also check the intercooler tank, the pipes and the pump before thinking about the head gasket.
  3. 3Medium severityFrequency: OccasionalCoolingWater pump and thermostat module (thermal management) leakOn the B58 the water pump and the thermostat module (thermal management) can leak coolant, with a low-level warning and traces of fluid at the back of the engine. Guides place pump failures between 75,000 and 120,000 miles and module failures from around 40,000.Appears at around 120,000 km

Cars fitted with the B58B30M2 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 B58B30M2 engine reliable?

Our verdict is “Buy”. The documented failures relate to the first series and to units built before 2021; we have found no faults specific to the TU2, although it has only been on the road for a few years and there is little real-world experience.[1][2]

What faults does the B58B30M2 engine have?

The documented ones that affect this version, by importance: oil leak from the valve cover gasket (medium severity), coolant loss from the cap or the expansion tank (medium severity) and water pump and thermostat module (thermal management) leak (medium severity).

Which cars use the B58B30M2 engine?

BMW Serie 3 G20 (since 2019), BMW Serie 4 G22 (since 2020), BMW X5 G05 (since 2018), BMW X6 G06 (since 2020), BMW X7 G07 (since 2018) and BMW X3 G45 (since 2024).[3][4][5][6]

Are you buying a car with the B58B30M2 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 B58 EngineFCP Euro · Technical documentation · consulted 9 October 2026
  2. The Popular BMW B58 Inline-Six Engine Has One Big Achilles HeelThe Autopian · Motoring press · published 14 June 2024 · consulted 9 October 2026
  3. BMW B58Wikipedia (alemán) · Other source · consulted 9 October 2026 · in German
  4. BMW B58Wikipedia (inglés) · Other source · consulted 9 October 2026
  5. BMW X3 (G45)Wikipedia (inglés) · Other source · consulted 31 October 2026
  6. BMW X3 G45: enginesCars-data.com · Technical documentation · consulted 31 October 2026