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Seat Looseness

46299 Views 107 Replies 37 Participants Last post by  rorz12
I couldn't find the original thread on this subject, so forgive me for starting over. (Maybe it was the other forum.) I finally got around to looking under the seat and this is the letter I wrote to BMW. I'll let you know if and when I here back.

There's a second issue I didn't mention, but I didn't want to muddy the waters. I also found that the thigh support can move a little if it's positioned anywhere other than full in.


I would like to bring to your attention an issue with the 6 Series front seats that seems to be common amongst many owners based on the forums that I read.

Simply put the front seats have a looseness that allows movement under load when the car is cornering. It does not take much lateral input to generate movement.

I have investigated this problem to isolate the cause. I am an engineer with 30 years automotive experience, so please take my analysis seriously and forward it to the appropriate personnel.

There is a cross-car steel support tube that passes through two (I assume urethane) bushings under the forward edge of the seat frame. This assembly is part of the mechanism used to raise and lower the front edge of the seat cushion. The bushings, attached to the seat cushion pan, are oblong in relation to the diameter of the tube to allow longitudinal movement as the mechanism is raised and lowered. Lateral movement is controlled by flared "stop" features on the steel tube on either side of the outside (driver) bushing. It is the relationship between the sides of this bushing and these stop features that is problematic.

If the front seat edge is adjusted to any position other than full stop (high or low), which places the tube firmly against the bushing, lateral movement can occur between the sides of the bushing and the flares on the tube. This motion is easily felt by the seat occupant as the bushing (and seat) bounce back and forth between the two stops on the tube. Hardly acceptable on this class of automobile.

Many 6 Series owners have taken their cars to the dealership with no resolution. A permanent solution needs to be driven from the top down. It seems a simple solution would be a wider, harder lubricious bushing to prevent the unwanted lateral movement without binding the adjustment mechanism. But I will leave that analysis the the BMW engineering staff.

Thank you for your attention to this important matter. I look forward to a solution and positive response.

Feel free to contact me at any time to discuss this further.

Best regards,
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Here's the reply. In the famous words of Harold Ramos "short, but pointless":

Thank you for contacting BMW of North America, LLC regarding your 2012 BMW 650i.

Our BMW engineering and design teams are dedicated to creating vehicles that move today's consumers and their demand for enhanced utility and more versatility. Customer feedback plays an integral role in improving product design and development. We appreciate the time you have taken to share your thoughts; your sentiments will be heard and considered.

The BMW Customer Relations and Services Department is available Monday through Friday from 9:00 A.M. to 9:00 P.M., Eastern Standard Time. You can reach us at 1-800-831-1117.


Erin Roberts
Customer Relations and Services
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Thanks, but that's a different issue, which I also had corrected by the dealer. I will keep the forum posted if I hear anything about the bushing issue. My dealer is working it from their angle too. In the meantime, I think I have a bandaid solution which I will try this weekend. If successful, I will share with the forum.
Thanks Cool. I have noticed that there is no movement when the front edge is at either extreme (full up or full down). In these cases the bar is tight against the white bushing preventing any movement or vibration. I was going to try a thick grease as you suggest but it has been too damn cold to work on my car. I am glad to hear this works. I will do the same when my garage floor goes above freezing.
I have the same issue.
Can you explain how to access to the under of the seat and put grease. I'm noot so keen od doing this kind of things, but the noise drive me crazy!!!
You can ask your dealer to do it. It is a tough reach and requires some flexibility. Just raise the front edge of the seat to its highest point and, kneeling from outside the car, bend over the threshold into the footwell and go for it.

You will see a steel bar running laterally through two white colored bushings. You want to apply a thick grease in and around these bushings. Good luck.
Not me. Mine seems to be getting worse. I going to take it in to my SA. Need new wiper blades anyway.
I'm sure it was my letter that did it. :rofl:
Funny that Chad's dealer has a specific cure (part from BMW) while some others are still waiting (per Southy's SA). I finally got around to the lube fix (used a thicker syn grease I applied with my finger - hold the jokes) and it seems to have fixed the problem, or at least it's less noticeable. I don't know how long this will last, but I'm thinking of cancelling my service appointment until my SA has a documented permanent fix from BMW in hand.
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