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B58B30O1

B58TU 374 hp (B58B30O1, M340i, M440i and M240i, since 2019) engine: faults and reliability

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

With caution

The Autopian notes that the first M340i models (2019-2020) without the ZTK package have the oil pump with a plastic housing, with some failures before 30,000 miles; check that it has been replaced.[1]

Years
since 2019
Power
374 hp
Faults that affect it
5
1 of high or critical severity
Cars that use it
4
in our database

3 sourcesHow we work

What changes in this version

High step of the TU: 374 hp (275 kW) and 500 N·m in the M340i xDrive, the M440i and the M240i (G42) according to German Wikipedia; English Wikipedia lists the B58B30O1 variant at 387 hp, which German Wikipedia assigns to the M340i outside Europe.[2][3]

Engine codes of this version: B58B30O1.

Faults of the B58B30O1 engine

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

  1. 1High severityFrequency: OccasionalLubricationFailure of the oil pump with a plastic rotor housingB58s built before 2021 have an oil pump with a plastic rotor housing which, according to US press and retailers, can fail: abnormal oil pressure, a whine and warnings. It is cited on 2019-2020 M340i models without the ZTK package and on X5 and X7 models built before mid-2020.
  2. 2Medium severityFrequency: CommonLubricationOil and coolant leak from the plastic oil filter housingThe B58's plastic oil filter housing can crack or lose its seal with heat and age, letting oil, coolant or both escape. One parts retailer puts the failure between 60,000 and 100,000 miles (roughly 97,000-161,000 km).Appears at around 97,000 km
  3. 3Medium 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
  4. 4Medium 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.
  5. 5Medium 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 B58B30O1 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 B58B30O1 engine reliable?

Our verdict is “With caution”. The Autopian notes that the first M340i models (2019-2020) without the ZTK package have the oil pump with a plastic housing, with some failures before 30,000 miles; check that it has been replaced.[1]

What faults does the B58B30O1 engine have?

The documented ones that affect this version, by importance: failure of the oil pump with a plastic rotor housing (high severity), oil and coolant leak from the plastic oil filter housing (medium severity), 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 B58B30O1 engine?

BMW Serie 3 G20 (since 2019), BMW Serie 4 G22 (since 2020), BMW X3 G01 (2017–2024) and BMW X4 G02 (2018–2024).[2][3]

Are you buying a car with the B58B30O1 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. The Popular BMW B58 Inline-Six Engine Has One Big Achilles HeelThe Autopian · Motoring press · published 14 June 2024 · consulted 9 October 2026
  2. BMW B58Wikipedia (alemán) · Other source · consulted 9 October 2026 · in German
  3. BMW B58Wikipedia (inglés) · Other source · consulted 9 October 2026