BMW/B58

BMW · Bi-turbo

B58

340i·F30·2016–2019·2,998 cc

"B58 is generally considered reliable, but any leak in the integrated intake/intercooler system will cause huge issues."

GOOD

74/ 100

"Strong six, but watch the integrated systems"

552

Max HP

650

Torque Nm

10,000

Oil interval km

Recalls

Known issues

Known Issues

Integrated Intake Manifold / Intercooler Leaks€600-2,000 · 60,000-150,000 kmHIGH

The B58 uses a liquid-cooled integrated intercooler built into the intake manifold. Any leak in this system can cause significant reliability issues including loss of boost, coolant contamination, and potential engine damage. The design is performance-efficient but vulnerable to seal and hose deterioration over time.

Loss of boost pressure

Coolant loss without visible external leak

Misfires or rough running

White smoke from exhaust

Overheating

DIY: Hard

Turbocharger Reliability Under Harsh Conditions€1,500-4,000 · 100,000-200,000 kmHIGH

While the B58 turbocharger is generally considered reliable, turbo failure can occur over time, particularly if maintenance has been neglected or the engine subjected to sustained hard driving. Oil starvation and heat soak are primary contributors.

Whining or whistling noise at increasing RPM

Loss of power

Excessive oil consumption

Engine entering limp mode

Smoke from exhaust

DIY: Hard

Water Pump Failure€400-1,200 · 80,000-160,000 kmMODERATE

Water pump issues are a recurring theme across the BMW B-series and predecessor N-series engines. The B58 uses an electric water pump which can fail or produce unusual noises, leading to coolant circulation problems and overheating risk.

Overheating warning

Buzzing or grinding noise from engine bay

Coolant temperature fluctuations

Pump running excessively after engine off

DIY: Moderate

Coolant Hose and Connector Deterioration€150-600 · 80,000-150,000 kmMODERATE

Coolant hoses and electrical connectors at the water pump and thermostat are known to degrade, leading to coolant leaks or sensor faults. Bare or corroded wiring at these components can cause misdiagnosis and cooling system faults.

Coolant warning light

Intermittent cooling faults

Visible coolant residue near pump or thermostat

Erratic temperature gauge

DIY: Easy

Buying Checklist

Pressure test the entire cooling system and inspect integrated intercooler/intake manifold for leaks or residue

Scan with BMW ISTA or equivalent OBD tool for any stored fault codes related to boost, cooling, or turbo

Listen for any buzzing, grinding, or whining noises from the electric water pump at idle and after shutdown

Check full service history for oil change intervals — avoid any car serviced beyond 10,000 km between oil changes

Inspect coolant hose connections and wiring connectors at the water pump and thermostat for corrosion or bare wires

Verify the turbocharger shows no shaft play and no smoke under hard acceleration or at idle warm-up

Service Reality

Community oil interval10,000 km

Oil specificationBMW Longlife-04 approved 0W-30 or 5W-30 fully synthetic

Est. ownership cost (2yr)€800–2,500 per year depending on mileage, maintenance history, and whether cooling or turbo components require attention

Real fuel consumptionNo data

Also Found In

BMW 440i (F32/F36)BMW 540i (G30)BMW 740i (G11)BMW X3 M40i (G01)BMW X5 40i (G05)BMW Z4 M40i (G29)Toyota Supra GR (A90)

Buying Advice

The BMW B58 in the F30 340i is a genuinely strong engine with a well-deserved reputation for being a step forward from its predecessors, but it is not trouble-free at higher mileages. The integrated intercooler and complex cooling architecture mean that deferred maintenance or neglected inspections can turn minor leaks into expensive repairs quickly. Always insist on a full cooling system pressure test and a diagnostic scan before purchase. A well-maintained example with documented short oil intervals is a solid buy; walk away from anything with patchy service history or cooling system faults.

Parts People Buy

BMW B58 Electric Water PumpLink unavailable

BMW B58 Coolant ThermostatLink unavailable

BMW B58 Intake Manifold Intercooler Seal KitLink unavailable

BMW Longlife-04 0W-30 Fully Synthetic Engine OilLink unavailable

BMW B58 Coolant Hose SetLink unavailable

* As an Amazon Associate I earn from qualifying purchases.