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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #176  
Old 03-06-2013, 03:47 PM
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fun2drive fun2drive is offline
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On behalf of Kat and myself you are welcome.
Now post some pics of your convertible!!
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  #177  
Old 03-16-2013, 09:29 AM
Joe in Dublin Joe in Dublin is offline
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Im noticing a creaking sound from drivers side of the joint between the first and second roof panel. If the window is up its not as bad. With window down if i tug on roof i can induce the creak sound. Anyone else have this issue and a fix for it. It may just need a little grease
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  #178  
Old 03-17-2013, 09:38 PM
jchastn jchastn is offline
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Every BMW owner in northern states should have Gummi Pflege and apply on door seals every winter. It resists freezing and sticking in cold climate areas. Amazing product!
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  #179  
Old 03-30-2013, 10:49 AM
bmw2907 bmw2907 is offline
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Hello,

Firstly, thanks for the detailed post! I have a question relating to one of your of the comments in the opening post - 'Silicon is a natural enemy of rubber. It makes rubber swell and fracture'

If the above is true why are there so many Silicon based products for sale designed to protect rubber?

I was planning on buying this product - http://www.halfords.com/webapp/wcs/s...egoryId_228374

but when I read this post I began to think twice? Also isn't Gummi Pflege a type of Silicon?

Any clarification on this topic would be appreciated.

Thanks,
BMW2907

Last edited by bmw2907; 03-30-2013 at 10:50 AM.
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  #180  
Old 03-30-2013, 12:33 PM
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fun2drive fun2drive is offline
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I defer to Kat on this since she is a chemist and I am an engineer.
However I find this article which is very old to be very useful to understand how to keep your top in great shape.
http://forums.vwvortex.com/showthread.php?3087297
I know some silicons contain acid which having a low pH is bad news for rubber and anything that touches it.
I do use Gummi Pfledge and Krylox as well with good results.
Hopefully Kat can amplify her input to clarify what she meant...
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  #181  
Old 03-30-2013, 06:13 PM
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Nordic_Kat Nordic_Kat is offline
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Quote:
Originally Posted by bmw2907 View Post
Hello,

Firstly, thanks for the detailed post! I have a question relating to one of your of the comments in the opening post - 'Silicon is a natural enemy of rubber. It makes rubber swell and fracture'

Any clarification on this topic would be appreciated.

Thanks,
BMW2907
First of all, I am not a polymer chemist, my area of experience is more petroleum based; but as such, I'll give you my understanding of the issue.

The "rubber" seals on our cars are a synthetic polymer (elastomer) called ethylene propylene diene monomer. EDPM, aka 'M-class' rubber. With all those -enes contained within the chemical structure, there are a fair number of double bonds (potentially reactive sites). The problem becomes when the silicon which is not inert is introduced to the elastomer. Potential for breaking the exsiting double bonds and creating new bonds with the silicon is introduced. Now, add in the chance that the silicon protectant being employed is oil based not water based. Hydrocarbons and rubber don't play nice with each other at all. I see this every day in the lab when we receive samples (usually gasoline spills) from environmental labs, and they have put the samples in glass vials with a rubber septum cap and the septum is swelling up and oftentimes leaking. Third problem, UV exposure. That's pretty much unavoidable. But just like in our bodies, UV exposure will promote free radical formation which becomes another hot spot for unfavorable chemical reactions to take place. With all this uncertainty, and not being privy to the proprietary chemical formulations of all the different rubber protectants on the market, the safest and most prudent seems to be to go with what is known to work. Gummi Pflege and Krytox each get a seal of approval with that regard.

ps: Years ago, in an effort to "do the right thing" I weekly treated the tires on my car with a widely available in autoparts stores product which was silicon based. About halfway through the tires' life span I noticed that all four tires were starting to split in a place one would not associate with wear. Turns out they were diagnosed with "dry-rot".
The cause of the dry rot?
My vigilant usage of chemicals that were in reality hastening the demise of the tires. Interestingly, the product I was using is no longer available.

Lesson learned.

And, finally to answer your question, to my knowledge - Gummi Pflege is not a silicon containing product. If you have information contrary I would be interested. (You now have me curious to do the experiment and do an analysis of the gummi pflege looking for the proper repeating pattern we see in our simulated distillation analysis when silicon is present.)

Hope this helps.
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  #182  
Old 04-29-2013, 07:54 AM
DarkHorseMBA DarkHorseMBA is offline
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Thanks for the great information. It seems that the Gummi is easier to apply than Krytox. Is this the case, and is the extra work for Krytox worth the effort? (Last longer between applications, etc)
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  #183  
Old 04-29-2013, 03:20 PM
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Quote:
Originally Posted by DarkHorseMBA View Post
Thanks for the great information. It seems that the Gummi is easier to apply than Krytox. Is this the case, and is the extra work for Krytox worth the effort? (Last longer between applications, etc)
I tend to use the Gummi on a weekly basis and the Krytox on a quarterly basis. In the winter, when the car doesn't get washed as regularly I tend to use the Krytox a little oftener. It's like a deep conditioning. My car is rattle and squeak free and almost 4 years old; so for me, the "extra work" worth the effort. FWIW: The Krytox also plumps the seals up enough to prevent a teeny little drip I get at the passenger side if the seals get too dehydrated.
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  #184  
Old 04-29-2013, 06:43 PM
DarkHorseMBA DarkHorseMBA is offline
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Keeping Your 3 Series Origami Top in Tip Top Shape

Quote:
Originally Posted by Nordic_Kat View Post
The Krytox also plumps the seals up enough to prevent a teeny little drip I get at the passenger side if the seals get too dehydrated.
Thanks!

BTW I saw that one of my tensioning cords is fraying. Did your dealer replace them all or just the frayed ones, and how long did it take? My local dealer's service stinks I have to twist their arm to get them to accept something needs replacement.



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  #185  
Old 04-30-2013, 10:38 PM
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I had both(?) replaced as both (if you mean rear) cords replaced under warranty.

From what I've gathered from other folks in Austin and San Antonio your dealerships aren't as accustomed to issues with the hardtop as our Houston dealerships are. Not sure about fraying issues on a 2011 as my understanding was they redesigned the cords with the LCI so with a 2011 you should have the new version of cords. The replacement cords I have are holding up very well.

PM me if you want details.
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  #186  
Old 05-08-2013, 04:48 PM
Astroman Astroman is offline
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Keeping Your 3 Series Origami Top in Tip Top Shape

This is a great post... I notice the seal are all dusty and sandy so will probably use a wet cloth to wipe it off first before applying Krytox. I am wondering if I should wait for it to dry off before apply or it does not matter.....


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  #187  
Old 06-07-2013, 12:26 PM
hondo402000 hondo402000 is offline
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is the gummy water based? it seem to me it kind of beads up but maybe that cause I use it over the krytox
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  #188  
Old 06-19-2013, 01:46 AM
sherts sherts is offline
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Amazing Good stuff thank u
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  #189  
Old 06-30-2013, 01:30 AM
tmdals0213 tmdals0213 is offline
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I spent the last 2 hrs reading everything to prepare for my coming e93 335is.

I can't thank enough for all the members on this thread and also on b'fest. Really appreciate all the hard work/tears/sweat/blood(nordic_Kat)/and stress into making this such a useful guide/help thread.

I hope this thread is always updated and we all can continue to help each other.

Again, thank you Kat and fun2drive for the guide.

-tmdals
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  #190  
Old 08-05-2013, 09:07 AM
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Nordic_Kat Nordic_Kat is offline
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Here are a couple of excellent literature references for the E93.

Thanks A B Able!




Quote:
Originally Posted by A B Able Truck View Post
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If your sport doesn't put blood, dirt or grease under your fingernails,
then it's just a game.

Euro Modded|Split Armrest|Rear Foglight Mod|BMW Performance Exhaust|CDV Delete|Shark Fin Antenna Delete|Front Reflector Delete|LUX H8 Angel Eyes|328i|3 Pedals|Das Fahren im Freien| BMWCCA#445793
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  #191  
Old 08-06-2013, 03:13 PM
TiAgger TiAgger is offline
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Kat, thank you for this great thread. I have a 2007 E93 (great car; bought it new) showing considerable wear on the tensioning cords you had replaced under warranty. I can't seem to find part numbers for the necessary replacement parts and I'm wondering if anyone can help. Many thanks.
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  #192  
Old 08-06-2013, 05:27 PM
Submariner Submariner is offline
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Quote:
Originally Posted by Nordic_Kat View Post
Here are a couple of excellent literature references for the E93.

Thanks A B Able!
Wouldnt it be nice to have a FuntoDrive/Nordic Kat collage of delightful color pics of where we can find the confounded sensors ...
Great resource. I shall definitely peruse the PDFs for sure!
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  #193  
Old 08-06-2013, 06:24 PM
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Nordic_Kat Nordic_Kat is offline
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Quote:
Originally Posted by TiAgger View Post
Kat, thank you for this great thread. I have a 2007 E93 (great car; bought it new) showing considerable wear on the tensioning cords you had replaced under warranty. I can't seem to find part numbers for the necessary replacement parts and I'm wondering if anyone can help. Many thanks.
So many folks have asked for this information, and I've sent it via PM enough times that I'm going to post up the copy of the service invoice for getting the cords replaced. This is no guarantee your dealership will do the same.
Attached Files
File Type: pdf BMW-Inv001-01.pdf (919.9 KB, 104 views)
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If your sport doesn't put blood, dirt or grease under your fingernails,
then it's just a game.

Euro Modded|Split Armrest|Rear Foglight Mod|BMW Performance Exhaust|CDV Delete|Shark Fin Antenna Delete|Front Reflector Delete|LUX H8 Angel Eyes|328i|3 Pedals|Das Fahren im Freien| BMWCCA#445793

Last edited by Nordic_Kat; 08-06-2013 at 08:21 PM. Reason: technical difficulty with pdf
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  #194  
Old 08-08-2013, 06:39 AM
TiAgger TiAgger is offline
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fraying cords

Thank you very much, Kat!
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  #195  
Old 08-11-2013, 08:12 PM
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mb67 mb67 is online now
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Good Crimeny, this is awesome info! Thanks from a 2008 (E93) owner!

Last edited by mb67; 08-11-2013 at 08:20 PM.
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  #196  
Old 08-12-2013, 07:08 AM
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fun2drive fun2drive is offline
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Lubrication Update: WD40 Dry Lube

WD40 now has a dry lube product which might be a good choice in place of the light lube but not the Wurth HH-K 2000.
I have not had the opportunity to test this product but here is the link to it. I will see if I can locate some and try it on hinge applications.

http://www.wd40specialist.com/products/dry-lube/

After searching and using Wurth HH-K 2000 there simply isn't anything I have found which is better for our top applications for heavy hinge areas.

More updates as products change formulations or expand product lines.

If you have personal knowledge please add to this thread as Kat and I may not see other suitable products for out tops...

Last edited by fun2drive; 08-12-2013 at 07:10 AM.
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  #197  
Old 09-13-2013, 03:36 PM
Kietv Kietv is offline
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I am so glad to read up on this information that Kat and Fun2drive put together. I am in the market for a pre-owned 328i cabriolet for my CFO (wife) and I have found a 2011
328i vert in white over blk color combo with only <12K miles, nearly all options, except for the PDC and M-Sport package. After reading this post I feel and have a little more confident to pull a trigger to bring this beatiful car home.

I was concerned at first abt the cost of a major repair like 14K or more for the retractable top especial when the car is out of warranty. May also worth to look into an extended warranty if we decided to keep the car a little longer.

This will be our first vert bimmer if the price is right from a 2000 323i, 2002 330i, a 2007 X5 and current ride is 2012 X5.

Thank you for putting together this great information ..

Last edited by Kietv; 09-15-2013 at 08:35 PM.
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  #198  
Old 09-15-2013, 12:51 PM
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Nordic_Kat Nordic_Kat is offline
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Kietv,

On behalf of fun2drive and myself, you are welcome. Your feedback is much appreciated.
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If your sport doesn't put blood, dirt or grease under your fingernails,
then it's just a game.

Euro Modded|Split Armrest|Rear Foglight Mod|BMW Performance Exhaust|CDV Delete|Shark Fin Antenna Delete|Front Reflector Delete|LUX H8 Angel Eyes|328i|3 Pedals|Das Fahren im Freien| BMWCCA#445793
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  #199  
Old 09-15-2013, 03:17 PM
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MP3_E46 MP3_E46 is offline
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Quote:
Originally Posted by Kietv View Post
May also worth to looking into an extended warranty if we decide to keep the car a little longer.
FYI: BMW's extended warranty explicitly excludes convertible tops.
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  #200  
Old 09-15-2013, 08:37 PM
Kietv Kietv is offline
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Quote:
Originally Posted by MP3_E46 View Post
FYI: BMW's extended warranty explicitly excludes convertible tops.
Is there any 3rd party extended warranty that covers the top or is there any company out there that you recommended?

Thank you much in advance.
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