What oil to refill trailing arms?

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Juvvajuvva
Joined: Sun 06 Nov, 2016 16:52
Posts: 43

  Z3 roadster 2.8

What oil to refill trailing arms?

Post by Juvvajuvva » Tue 08 Nov, 2016 09:51

Hi,
Would anyone happen to know what grade of oil BMW originally used inside the trailing arms and what amounts they used?
I can't find it in Bentleys or online.
Thanks in advance for any advice.

Juvvajuvva
Joined: Sun 06 Nov, 2016 16:52
Posts: 43

  Z3 roadster 2.8

Re: What oil to refill trailing arms?

Post by Juvvajuvva » Tue 08 Nov, 2016 18:29

Hi all,
Perhaps I should be a bit clearer. On the rear trailing arms there is a plug.When removed you can pour out an amount of what looks and smells like differential oil.
I did I this whenI had the diff carrier and trailing arms powder coated as the process requires 200 degrees to melt the paint.
I can only presume that BMW did this to prevent rusting inside the hollow arms.
I have asked BMW UK but the Techs didn't know and I don't know any American BMW original builders of the Z3 :-)
If anyone knows please let me know.
Sounds picky I know but if I can put back what was there,particularly weight wise it would be great.
Thanks again.

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Brian H
zroadster sponsor
Joined: Tue 16 Dec, 2008 19:55
Posts: 2502

  Z3 roadster 3.0i

Re: What oil to refill trailing arms?

Post by Brian H » Tue 08 Nov, 2016 19:17

Can you not just us a spray in waxoil solution?

Juvvajuvva
Joined: Sun 06 Nov, 2016 16:52
Posts: 43

  Z3 roadster 2.8

Re: What oil to refill trailing arms?

Post by Juvvajuvva » Tue 08 Nov, 2016 19:50

Hi Brian,
Yes I guess so, I have loads of it. I just thought I'd ask to see if anyone knew what BMW used and put back what was original.To be honest I was a bit surprised to see it coming out of the arm when I pulled the plug out and the reason for it being there.
Thanks Brian.

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c_w
Joined: Thu 19 Aug, 2004 17:50
Posts: 4032

  M roadster S50

Re: What oil to refill trailing arms?

Post by c_w » Tue 08 Nov, 2016 20:16

First I've heard of something like this, normally box sections would be wax injected, it makes no sense to oil fill it as it would just eventually leak out/add weight.

DINITROL is very good, it comes with a straw and can get in every nook and cranny you need, then sets as a semi-solid brown wax.

http://www.ebay.co.uk/itm/DINITROL-3125 ... 2401333113?

Juvvajuvva
Joined: Sun 06 Nov, 2016 16:52
Posts: 43

  Z3 roadster 2.8

Re: What oil to refill trailing arms?

Post by Juvvajuvva » Tue 08 Nov, 2016 20:23

Good shout C_W !
I recon that's the stuff I'll use :D
Thanks a lot.

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