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#982554 - 03/20/17 11:16 AM Re: Trans and Final drive oil [Re: georgem]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12997
Loc: Ohio
Originally Posted By: georgem
HI Dirt rider, I used Royal Purple in my '98RT and it did make the tray smoother. I'll give it a shot in the '12 model and see how it goes, thank you for all the info!


Morning georgem

In my experience the Royal Purple will noticeably make it shift better (for a short while), thing I have seen with the Royal Purple is the better shifting doesn't seem to last as that gear oil seems to shear easily.

BUT, I have only tried it a couple of times so don't have a broad test base.

Long term Mobil 1 75w140 seems to shift better longer in more bikes. Maybe not quite as good as the Royal Purple right after change but better at the 1000 up mile mark. It seems every bike is different so my suggestion is to try different gear oil's until you find something that you like (in your bike) long term.

Just don't judge right after the change as all the gear oil's seem to shift better right after a change (that is why we read all over the internet how this gear oil or that gear oil really improved shifting--they all seem to). The real test is for how long do they shift better?
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#982560 - 03/20/17 01:22 PM Re: Trans and Final drive oil [Re: dirtrider]
6speedTi Offline
Member

Registered: 05/26/12
Posts: 193
Yea I got it. I got a chuckle out of it. I also got your point. Try it and see if it works. Funny how BMW recommends 24,000 miles on the gearbox oil servicing. When I change the oil at 12,000 first obvious thing is smoother and quieter shifting. Unfortunately it does not last that long until it's back to normal.

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#982564 - 03/20/17 02:35 PM Re: Trans and Final drive oil [Re: 6speedTi]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12997
Loc: Ohio
Originally Posted By: 6speedTi
Yea I got it. I got a chuckle out of it. I also got your point. Try it and see if it works. Funny how BMW recommends 24,000 miles on the gearbox oil servicing. When I change the oil at 12,000 first obvious thing is smoother and quieter shifting. Unfortunately it does not last that long until it's back to normal.


Morning 6speedTi

Unfortunately that is one of the downsides to running the gear oil between all those meshing gears.

If I wanted to purposely shear gear oil I would probably run it thought fast spinning tight meshing gear sets.

This is also where researching the shear resistance of gear oil comes into play. Unfortunately that info is difficult to come up with & even more difficult to compare in real world longer mile usage.
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#982566 - 03/20/17 02:50 PM Re: Trans and Final drive oil [Re: dirtrider]
georgem Offline
Member

Registered: 10/01/04
Posts: 138
Loc: Southeast Texas
OK, got ya, o my "98 they recommended 140 and thats what I used in trans and final drive. This '12 model, all I have seen says use the 90wt. thats what I have purchased, but have not changed them yet.
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2012 R1200RT
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#982569 - 03/20/17 03:36 PM Re: Trans and Final drive oil [Re: georgem]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12997
Loc: Ohio
Originally Posted By: georgem
OK, got ya, o my "98 they recommended 140 and thats what I used in trans and final drive. This '12 model, all I have seen says use the 90wt. thats what I have purchased, but have not changed them yet.


Afternoon Georgem


Yes, the 1200 hexhead BMW manual called for Brand name hypoid-gear lubricant SAE 90 API GL5. I was surprised to find the newer camhead manual called for SAF-XO gear oil (that is a 75w90).

We have been using the 75w90 & 75w140 in the hexhead for a long time now (even a lot of BMW dealers do).

The straight 90 weight won't hurt the trans as the gears are pretty robust & will hold up fine with about any GL5 gear oil & most of the trans bearings are sealed so run in their own sealed-in grease.

At hot bike running temps probably not much difference between the straight 90 GL5 & 75w90 GL5 as far as operating viscosity is concerned. The BIG difference is in the cold shifting of the 75wXX over straight 90 weight.

The straight 90 weight is probably a bit less prone to shearing as the 75w90 & 75w140 have some polymers to get that viscosity spread but most of that is probably offset by the base stock quality being better on the up-level 75wXX. (not easy to find a high end good quality straight 90 weight gear oil that uses up-level base stock)
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#982647 - 03/21/17 02:17 PM Re: Trans and Final drive oil [Re: dirtrider]
Hank R1200RT Offline
Member

Registered: 10/06/14
Posts: 133
Loc: Agoura Hills, CA
Regarding: That was meant to be funny but I guess it didn't work.

Mine was too!
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Hank Murphy
2013 BMW R1200RT "Gretchen am Spinnrade"

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#982698 - 03/21/17 11:09 PM Re: Trans and Final drive oil [Re: georgem]
georgem Offline
Member

Registered: 10/01/04
Posts: 138
Loc: Southeast Texas
OK, guys, I had to make a trip to Houston today, so I went by the BMW dealership and got the OEM oil for final drive and trannie. now I dont have to worry if its compatible or not. Thanks for all the help and info!!
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2012 R1200RT
'73 Red R75/5

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#982704 - 03/22/17 02:39 AM Re: Trans and Final drive oil [Re: georgem]
lkraus Offline
Member

Registered: 05/28/11
Posts: 1196
Loc: Central Ohio
Originally Posted By: georgem
OK, guys, I had to make a trip to Houston today, so I went by the BMW dealership and got the OEM oil for final drive and trannie. now I dont have to worry if its compatible or not. Thanks for all the help and info!!


Well, that's one way to kill an oil thread. You really need to try harder and get into the spirit of things.

read
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Larry
2006 R1200RT

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#982723 - 03/22/17 02:02 PM Re: Trans and Final drive oil [Re: lkraus]
tallman Offline
Picture Perfect Humorist
Member

Registered: 12/22/02
Posts: 19610
Loc: Tallahassee, Florida
Originally Posted By: lkraus
Originally Posted By: georgem
OK, guys, I had to make a trip to Houston today, so I went by the BMW dealership and got the OEM oil for final drive and trannie. now I dont have to worry if its compatible or not. Thanks for all the help and info!!


Well, that's one way to kill an oil thread. You really need to try harder and get into the spirit of things.

read


I wonder if they told him about the change in quantity?
smirk
JK
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Tim
Conch Town Krewe
2003 K 1200 GT
1996 R 100 RSL
1980 R 100 RT
1972 R 75
1968 R 50
All now gone...


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#982736 - 03/22/17 04:13 PM Re: Trans and Final drive oil [Re: tallman]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 12997
Loc: Ohio
Originally Posted By: tallman


I wonder if they told him about the change in quantity?


Afternoon Tallman

What change in oil quantity?-- As far as I know there is no change in the camhead, there was in the early hexheads but not the camheads (at least that I know about).

Is there some change to the camhead that we should know about?
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