01/29/2026
β οΈπ§ BMW B58 Oil Pump Failures β What Owners Need to Know
Weβve been seeing an increasing number of BMW B58 engines affected by oil pump failures, primarily in 2015β2020 Gen 1 and some early 2021 Gen 2 vehicles.
π Root Cause:
The failure typically originates from a plastic ring/carrier inside the oil pump housing that is moves to control amount of oil being output. This component is made from a very brittle plastic that is prone to cracking, especially in colder climates, which can lead to oil pressure instability.
π₯ Why This Is Serious:
A compromised oil pump can cause:
β Loss of oil pressure
β Dangerously high or erratic oil pressure
β Spun or seized bearings
β Complete engine failure
π© Common Symptoms:
β’ Whining or humming noise (often on cold starts)
β’ iDrive unable to read oil level
β’ Low oil pressure warnings
β’ Abnormally high oil pressure readings (often 47+ PSI at idle)
π οΈ The Fix:
BMW updated the oil pump design to an all-metal version around July 2020, which addresses the weak point found in earlier pumps. Replacing the original pump with the updated version is highly recommended given the potential for serous engine damage if the failure is not caught and fixed very quickly.
β
Preventative Measures:
β’ Pay close attention to cold-start noises
β’ Monitor oil pressure readings
β’ Ensure oil level readings function properly
β’ Use manufacturer-recommended oil only β thicker oils can increase stress on the plastic components and accelerate or even cause the failure
Early diagnosis is critical. If you own a B58-powered BMW and notice any of these symptoms, donβt ignore them β catching this issue early can save the engine.
Key 2015β2020 B58 Model Applications:
Β· 1 Series: F20/F21 M140i (2016β2019)
Β· 2 Series: F22/F23 M240i (2017β2021)
Β· 3 Series: F30/F31/F34 340i (2015β2019), G20 M340i (2019β2020)
Β· 4 Series: F32/F33/F36 440i (2016β2019), G22/G23/G26 M440i (2021)
Β· 5 Series: G30/G31 540i (2017β2020)
Β· 6 Series: G32 640i (2020)
Β· 7 Series: G11/G12 740i (2016β2020)
Β· 8 Series: G14/G15/G16 840i (2019β2020)
Β· X3/X4: G01 X3 M40i (2017β2020), G02 X4 M40i (2018β2020)
Β· X5/X6: G05 X5 xDrive40i (2018β2020), G06 X6 xDrive40i (2020)
Β· Z4: G29 Z4 M40i (2019β2020)
Β· Other: Toyota GR Supra (2019β2020)