TLDR: 2020 M340i/Supra oil pumps are failing prematurely due to a brittle plastic impeller. Despite a part redesign, BMW is denying liability and refusing goodwill repairs. Follow the link below to submit a formal complaint and help us force a recall.

Hello everyone,

The 2020 M340i/Supra oil pump is a known failure point. The original design uses a brittle plastic impeller that fails prematurely. While BMW claims "incorrect oil weight" causes these failures, even dealer-maintained cars are being affected.

BMW has since superseded the part number, which is an implicit admission of a design flaw. Yet they have issued no TSB or goodwill program. This leaves owners facing $3,000+ repair bills because the subframe must be dropped for replacement.

I know many people who have already been or will soon be affected by this issue, as it usually happens around 50k mi mark. The biggest sign that your pump is failing is being unable to complete an oil measurement in iDrive.

I reached out to complain to BMW regarding this issue to see why they’ve been silent on an issue plaguing these cars.

BMW North America claims they haven’t received enough complaints to take action. It’s time to change that.

How to Help

If you are in the USA, please submit a formal complaint to BMW Corporate using the link below. Be sure to include your VIN.

Link: BMW USA Contact Form

If you’re outside the USA, please submit the complaint through your country’s BMW site.

Copy/Paste this message into the comments section:

I am writing to express my deep disappointment regarding an oil pump failure on my vehicle at [Mileage] miles. While the vehicle is technically past its warranty period, a failure of this critical component at this mileage points to a latent manufacturing defect rather than expected wear.

The fact that the original part number has been superseded suggests a known design flaw. I am requesting that BMW investigate this issue and initiate a formal recall or proactive goodwill repair action to address it. I look forward to your prompt response regarding how you intend to rectify this matter for your customers.

Be sure to include your VIN in the contact form, as this is what BMW uses to track the number of complaints, according to the customer service rep.

If enough of us speak up, we can hold BMW accountable and secure the resolution we deserve.