Which gearbox oil?

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Gareth 161
Joined: Thu 08 Mar, 2012 23:41
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  Z3 roadster 3.0i
Location: Cornwall

Which gearbox oil?

Post by Gareth 161 » Sat 14 Jan, 2017 20:43

Having just recently bought a 3.0 2000 z3, am having the same notchy gear change as in my old 2.8 z3.
On that one I changed the clutch hose and fluid together with putting in the Fuchs mtf oil which helped a lot.
However have just done the clutch hose and fluid on new one but cannot see a label on the gearbox to identify which oil to put in. My old one had a yellow label and hence the Fuchs titan sinto fluid 75/80 was the correct one.
Does anyone know which oil my new car would require?
Not sure if would be a standard oil for that year and model or would it vary. Have tried to research on the web but seems to be a very confusing subject!
Also saw some reference to not using gl5 if gl4 recommended as would destroy bearings?
Tempted to just use the Fuchs again unless anyone can clarify the point or recommend a better oil for curing a notchy gear change.
Thanks
Gareth
2001 3.0 Z3, 2008 Subaru Forester Xten

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c_w
Joined: Thu 19 Aug, 2004 17:50
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  M roadster S50

Re: Which gearbox oil?

Post by c_w » Sat 14 Jan, 2017 21:55

It's the exact same gearbox so use the same stuff as before that you were happy with :)

I run AMSOIL MTF in my Z3M (same gearbox) and it's not notchy hot or cold, it's nice and light.

Gareth 161
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  Z3 roadster 3.0i
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Re: Which gearbox oil?

Post by Gareth 161 » Sat 14 Jan, 2017 22:18

Yes I was looking at the Amsoil mtf but it showed it as 5-30 which seemed a lot lower numbers?
If that is the right stuff, where can it be bought please.
2001 3.0 Z3, 2008 Subaru Forester Xten

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Gazza
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Re: Which gearbox oil?

Post by Gazza » Sun 15 Jan, 2017 13:10

Gearbox with yellow sticker - BMW Lifetime oil – LL1 or 2
Fuchs Titan Sintofluid SAE 75w-80 (as per original factory fill)
Amsoil MTF SAE 5-30 (SAE 75w-85 on gear oil viscosity)


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Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

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Gareth 161
Joined: Thu 08 Mar, 2012 23:41
Posts: 104

  Z3 roadster 3.0i
Location: Cornwall

Re: Which gearbox oil?

Post by Gareth 161 » Sun 15 Jan, 2017 14:07

Thanks for the info and will probably go with the Fuchs as half the price unless the Amsoil is twice as good?.
Not sure what oil in there now as allegedly the gearbox oil changed before I purchased but no idea what was used.
Hoping that the Fuchs might improve things as would be the cheaper option other than removing box and looking at the pins or whatever. However have a nagging feeling that perhaps at 110k, it might be a mechanical issue but who knows!

Now off to try and change the inner and outer track rod ends as rusted up and they could not adjust the tracking which apparently was 10 degrees difference?
Gareth
2001 3.0 Z3, 2008 Subaru Forester Xten

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c_w
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Re: Which gearbox oil?

Post by c_w » Sun 15 Jan, 2017 18:02

It may have had some other oil which retains a notchy nature. 110k nothing for these gearboxes.

Gareth 161
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  Z3 roadster 3.0i
Location: Cornwall

Re: Which gearbox oil?

Post by Gareth 161 » Sun 15 Jan, 2017 22:29

Even more confused now after looking at the net
Bit worried that the Fuchs is gl5 which if I am reading things correctly, will eat up the bronze inards of the gearbox?
Has anyone used the redline mtl 75-80 which is gl4 and per the sales write up will reduce the notchy feel and should give better wear protection than atf which I read somewhere could also be used.
All very confusing
Westway also seem to do a 75-80 gl4 mtl which again per their write up, would be very good and is cheaper than the redline.
HELP !!
2001 3.0 Z3, 2008 Subaru Forester Xten

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stevov
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Re: Which gearbox oil?

Post by stevov » Mon 16 Jan, 2017 06:46


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Gazza
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Re: Which gearbox oil?

Post by Gazza » Mon 16 Jan, 2017 19:45

Go with Westway or Redline if they meet the specs required.

I would add that changing my gearbox oil did relieve the notchy feel.

I used an ATF which seemed strange at the time.
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

S54 M roadster Image Mustang Fastback, BMW Z1, BMW M3 CSL.

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Gareth 161
Joined: Thu 08 Mar, 2012 23:41
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  Z3 roadster 3.0i
Location: Cornwall

Re: Which gearbox oil?

Post by Gareth 161 » Mon 16 Jan, 2017 19:58

Thanks for all the help so far.
Will be checking with my garage to see if CDV actually removed when they fitted braided hose or is that a given?
My problem is knowing what specs the oil should be as can't see any label on box and handbook just says filled for life! Which is little use.
Was hoping that there was some oil such as the westway or redline 75/80 mtl which would be ok whatever the specs and would not degrade the brass bits if it was a gl4.
Pity bmw make something which should be very simple so complicated
2001 3.0 Z3, 2008 Subaru Forester Xten

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Gazza
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Re: Which gearbox oil?

Post by Gazza » Mon 16 Jan, 2017 22:24

I'll check tomorrow if I still have some of what I used and will check the specs.

If Westway and Redline meet the specs they should be ok.

The CDV isn't a valve as such, it's a restriction in the end fitting of the hose. The braided type as sold by Earls has a larger bore.
Gazza

"Understeer is when you hit the wall with the front of the car, oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and torque is how far you take the wall with you"

S54 M roadster Image Mustang Fastback, BMW Z1, BMW M3 CSL.

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Gareth 161
Joined: Thu 08 Mar, 2012 23:41
Posts: 104

  Z3 roadster 3.0i
Location: Cornwall

Re: Which gearbox oil?

Post by Gareth 161 » Tue 17 Jan, 2017 00:11

Thanks and will be good to know what you used.
Not sure if it makes a difference but my braided hose was made by HEL and not Earle's
2001 3.0 Z3, 2008 Subaru Forester Xten

siwilson
Joined: Fri 19 Jun, 2009 10:54
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Location: Horley

Re: Which gearbox oil?

Post by siwilson » Tue 17 Jan, 2017 10:55

i switched from BMW OEM to Redline MTL a year ago. Now the gearbox is a little sticky when stone cold, but definitely much better than stock when it warms up. The BMW OEM seemed slightly better when cold, but did not change when the gearbox warmed up.
2001 M roadster S54 Laguna Seca Blue

Del
Joined: Sat 19 Nov, 2011 18:35
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  Z3 roadster 1.9

Re: Which gearbox oil?

Post by Del » Tue 17 Jan, 2017 11:15

Put this is my 1.9 Getrag gearbox - feels nice - I've changed it twice now - modern synthetic gear oil (GL4) with the contemporary 75w-90 viscosity range

http://www.ebay.co.uk/itm/1-Litre-1L-Ca ... Sw9GhYdhNy

Del
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  Z3 roadster 1.9

Re: Which gearbox oil?

Post by Del » Tue 17 Jan, 2017 11:34

With gearbox oils one needs to get the basic parameters correct e.g fully synthetic (robust and long lasting) and GL4 (erring on the side of caution as mentioned above and not using GL5).
The rest is largely based on subjective taste and preference. Many people do not like a firmer “notchy” feel when cold but such oils will offer a smooth and less noisy operation when hot. Historically this is why ATF was used in some manual boxes although this might make them noisier when hot.
BMW manual gearbox oils have evolved in any event. MTF-LT-1 is obsolete and was thought to be mono viscosity 75W. MTF-LT- 2 was 75W-80. Both were GL4
If you put one in and don't like the feel when cold, you can change it again easily for say a thinner mono 75W and would have done no harm - in fact you would have done good by "flushing" the gearbox with a couple of quick succession oil changes. :)

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lightning
Joined: Tue 27 Nov, 2007 08:15
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Re: Which gearbox oil?

Post by lightning » Mon 27 Mar, 2017 20:35

I removed the CDV from my 3.0 Z3 some time ago and it did make the gear change better.
However l just had a new clutch fitted and then found
fast gear changes a bit jerky. So l refitted the CDV and it is smoother and easier to get snatch free gear changes. (I am talking about spirited driving but not anywhere near the limits of the car)

Removing the CDV may help if you drive the car hard or on the track, but for normal driving it seems to make it easier to drive smoothly with it fitted.

4wheels
Joined: Sat 24 Sep, 2016 20:42
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  Z3 roadster 3.0i

Re: Which gearbox oil?

Post by 4wheels » Sat 15 Apr, 2017 18:38

Changed mine today to stop it leaking. The aly washer had gone bad and leaked.
Put fuchs 75/140 in it.
What a difference, put more in than came out due to leak... And now very very little clunk when changing gears
I guess when I do gearbox oil it will dissappear all together

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