[Pimpsy]

Yes, once again, the expansion tank must be replaced.
This ridiculous design flaw needs to be addressed unless they plan to replace these under warranty forever.
How annoying...

[Alberta]

So sorry to read this...

How long ago was the other tank installed ? Or how many miles ?

[F30Andy]

Same situation here.

Im on the tank with the new part number whihc was installed only two months ago and it has failed already.

This is literally the 8th tank I am on now.

[pbonsalb]

The aftermarket billet $750-1000 tank won’t leak though the cap could still release coolant if pressure is too high. Keeping the coolant a little cooler might reduce pressure. Heat causes expansion.

[Alberta]

Originally Posted by F30Andy

Same situation here.

Im on the tank with the new part number whihc was installed only two months ago and it has failed already.

This is literally the 8th tank I am on now.

That's crazy...

[NoMods]

Originally Posted by pbonsalb

The aftermarket billet $750-1000 tank won’t leak though the cap could still release coolant if pressure is too high. Keeping the coolant a little cooler might reduce pressure. Heat causes expansion.

but i have a feeling if BMW sees that aftermarket tank they would find a way not to pay for any warranty work etc.

[pbonsalb]

Yes - BMW can deny warranty for aftermarket parts and tune. If you have a warranty, you can rely on that instead. I like mods and DIYing — I don’t need the tank. I have addressed the issue through other ways. But for some it is worth considering.

[hookson]

Might consider:

https://1evel.us/products/f90-m5-f9x...lant-catch-pan

https://youtu.be/rdUNO_ms9xA?si=fZUbEOI7kddAfqxN

[Greer]

I own a 2022 and have had no issues with the tank, is this only on pre- LCI M5's?

[hookson]

Originally Posted by Greer

I own a 2022 and have had no issues with the tank, is this only on pre- LCI M5's?

There were plenty reports of LCI model failures as well unfortunately.

[Aronis]

Originally Posted by hookson

Might consider:

https://1evel.us/products/f90-m5-f9x...lant-catch-pan

https://youtu.be/rdUNO_ms9xA?si=fZUbEOI7kddAfqxN

$490...cost more than the tank. LOL. BMW needs to eat this problem and install the catch thing for FREE.

Mike

[logicators]

Perhaps we should start an email campaign where everyone on this forum takes responsibility of sending an email to BMW corporate asking for a status of the permanent solution? We can take turns, and everyone can follow up once a month. At some point they will get sick and tired of our emails and fix it.

Email: customerrelations@bmwusa.com

[pmsteinm]

Originally Posted by logicators

Perhaps we should start an email campaign where everyone on this forum takes responsibility of sending an email to BMW corporate asking for a status of the permanent solution? We can take turns, and everyone can follow up once a month. At some point they will get sick and tired of our emails and fix it.

Or they will discontinue the F90 and replace it with some bloated overly complex...oh wait...

[logicators]

Originally Posted by pmsteinm

Or they will discontinue the F90 and replace it with some bloated overly complex...oh wait...

Just sent them the following, will report back when they respond:

“
Hello,

I own a 2023 M5 (purchased new in November 2022 from BMW of XYZ). It's my first BMW and I love the overall M5 driving experience.

However I am deeply concerned about the coolant expansion tank. I actively participate in online F90 forums, and it seems like the coolant expansion tank seems to fail for almost all owners (both pre-LCI and LCI). In many cases, it also damages critical engine components underneath the tank and results in expensive repairs.

While interacting with other owners, I learned that these failures keep happening (even with the recently revised part number) and there are several owners that needed the tank replaced multiple times (an owner I interacted with on bimmerpost today is on tank #8 !!!!!).

Can you please advise what's your plan to properly and permanently fix this issue? It's a major design flaw impacting all F90 M5s (ticking time bomb), and I am very surprised to see no official recall and replacement part that properly fixes this critical issue.

Appreciate your help in advance,

[Pimpsy]

Originally Posted by logicators

Just sent them the following, will report back when they respond:

“
Hello,

I own a 2023 M5 (purchased new in November 2022 from BMW of XYZ). It's my first BMW and I love the overall M5 driving experience.

However I am deeply concerned about the coolant expansion tank. I actively participate in online F90 forums, and it seems like the coolant expansion tank seems to fail for almost all owners (both pre-LCI and LCI). In many cases, it also damages critical engine components underneath the tank and results in expensive repairs.

While interacting with other owners, I learned that these failures keep happening (even with the recently revised part number) and there are several owners that needed the tank replaced multiple times (an owner I interacted with on bimmerpost today is on tank #8 !!!!!).

Can you please advise what's your plan to properly and permanently fix this issue? It's a major design flaw impacting all F90 M5s (ticking time bomb), and I am very surprised to see no official recall and replacement part that properly fixes this critical issue.

Appreciate your help in advance,

Nicely put. Please follow up with their reply.
Thank you.

[logicators]

Originally Posted by Pimpsy

Nicely put. Please follow up with their reply.
Thank you.

Heard back from them today, very generic and hand wavy response:

“Thanks for writing to BMW regarding your 2023 BMW M5 and congratulations on your recent purchase. I’m sorry to learn of your concerns about the coolant expansion tank.

While I do understand the importance of your concern, please know that we rely solely on the service teams at our authorized BMW centers to assist our customers with maintaining, diagnosing, and repairing vehicles.

To locate a center for assistance, please visit www.BMWUSA.com/dealer.

Should you need to contact Customer Relations and Services again, you can reach us at 1-800-831-1117 Monday through Thursday from 9:00 a.m. to 9:00 p.m. ET and Friday from 9:00 a.m. to 6:00 p.m. ET.

Have a nice day.

Kind regards,

Abigail
Customer Relations and Services
Representative”

I pushed back:

“
Hi Abigail,

Thank you for getting back to me. This issue is not about an individual vehicle, but a manufacturing defect that is impact all F90 M5s. Can you please share my original message with the team responsible for developing the M5 product and request that they respond on how they are planning to permanently fix this issue?

Please understand that this is a serious concern shared by dozens of M5 owners I am in communication with. Waiting for the failure to happen on a given F90 M5 and going to a service center is NOT a good recommendation since it may already be too late and the damage already done.

“

[ResIpsaLoquitur]

Originally Posted by logicators

Heard back from them today, very generic and hand wavy response:

“Thanks for writing to BMW regarding your 2023 BMW M5 and congratulations on your recent purchase. I’m sorry to learn of your concerns about the coolant expansion tank.

While I do understand the importance of your concern, please know that we rely solely on the service teams at our authorized BMW centers to assist our customers with maintaining, diagnosing, and repairing vehicles.

To locate a center for assistance, please visit www.BMWUSA.com/dealer.

Should you need to contact Customer Relations and Services again, you can reach us at 1-800-831-1117 Monday through Thursday from 9:00 a.m. to 9:00 p.m. ET and Friday from 9:00 a.m. to 6:00 p.m. ET.

Have a nice day, Hassan.

Kind regards,

Abigail
Customer Relations and Services
Representative”

I pushed back:

“
Hi Abigail,

Thank you for getting back to me. This issue is not about an individual vehicle, but a manufacturing defect that is impact all F90 M5s. Can you please share my original message with the team responsible for developing the M5 product and request that they respond on how they are planning to permanently fix this issue?

Please understand that this is a serious concern shared by dozens of M5 owners I am in communication with. Waiting for the failure to happen on a given F90 M5 and going to a service center is NOT a good recommendation since it may already be too late and the damage already done.

“

What a cop out. That’s disappointing but perhaps somewhat expected. Nothing irritates me mora than a canned response to a genuine CS request. Good for you for raising this issue to begin with and for pushing back.

Please keep us posted on the next (likely canned) response.

[NoMods]

Originally Posted by logicators

Heard back from them today, very generic and hand wavy response:

“Thanks for writing to BMW regarding your 2023 BMW M5 and congratulations on your recent purchase. I’m sorry to learn of your concerns about the coolant expansion tank.

While I do understand the importance of your concern, please know that we rely solely on the service teams at our authorized BMW centers to assist our customers with maintaining, diagnosing, and repairing vehicles.

To locate a center for assistance, please visit www.BMWUSA.com/dealer.

Should you need to contact Customer Relations and Services again, you can reach us at 1-800-831-1117 Monday through Thursday from 9:00 a.m. to 9:00 p.m. ET and Friday from 9:00 a.m. to 6:00 p.m. ET.

Have a nice day.

Kind regards,

Abigail
Customer Relations and Services
Representative”

I pushed back:

“
Hi Abigail,

Thank you for getting back to me. This issue is not about an individual vehicle, but a manufacturing defect that is impact all F90 M5s. Can you please share my original message with the team responsible for developing the M5 product and request that they respond on how they are planning to permanently fix this issue?

Please understand that this is a serious concern shared by dozens of M5 owners I am in communication with. Waiting for the failure to happen on a given F90 M5 and going to a service center is NOT a good recommendation since it may already be too late and the damage already done.

“

typical big corporate reply, means to pacify you and pretend they care, only if they get some bad media attention then something might happen.

[GTTC]

Following, since mine is also a ticking bomb.

[justanotheruser]

Just bought my 2018 M5, very first thing I had checked was the expansion tank. Mine is good for now... but how long did your last tank go for mileage wise?

[logicators]

Originally Posted by justanotheruser

Just bought my 2018 M5, very first thing I had checked was the expansion tank. Mine is good for now... but how long did your last tank go for mileage wise?

I have seen no consistent pattern. Some last 50K miles whereas others fail in a few thousand.

[logicators]

Just received this:

“Thanks for contacting BMW.

As a follow-up to your conversation with BMW of North America, LLC, this email is to notify you that your case has been forwarded to our case management team. You can expect a call from a Case Management Specialist in approximately one to five business days.

We truly appreciate the time you took to reach out to us and look forward to the opportunity to try and further assist you.


All the best,
BMW of North America“

I did not provide a phone number in my original email so not sure where will they call, but at-least there seems to be a case created. Let’s see where it goes