I-BMW.com I-BMW.com

Welcome to the I-BMW.com forums! - You're currently viewing as a limited access guest. By joining our free member supported community, you'll gain access to post/ reply, communicate privately with other members (PM), or globally via "real time chat", respond to polls, upload photos, post classifieds etc. Membership is fast so, Register @ the Ultimate Sport Touring Portal!
Should you not receive an email with activation link, check your SPAM settings or please contact us and include the ID/ email address you registered with.

Go Back   I-BMW.com > BMW K-1200 Series Motorcycles > K1200RS/GT > "KRS/GT" Gen. Discussions
User Name
Password
Home Register Gallery Classifieds FAQ Members List Calendar Donate Mark Forums Read

"KRS/GT" Gen. Discussions All about the bike

Vendor Sign Up | Want to see your name in neon blue? | Want a neat reflective sticker for your ride?!

Reply
 
Thread Tools.. Display Modes
  #1  
Old 05-01-2018, 05:35 PM
AJ Valente's Avatar
AJ Valente AJ Valente is offline
Has gotten a ticket or two…
Post: 112 Thanks: 15
Thanked 30 Times in 16 Posts
 
Join Date: Jan 2015
Location: Claremont, NH USA
Limited Slip Gear Oil

A former K100 owner here, and the transmissions all had shifting issues if the gear oil was not changed regularly (as did the rear end). There was a great post on the K100 site about maintenance on K100s used by the London Police back in the day, and here it was found that the Castrol Syntrax 75W-90 gear oil virtually eliminated rear-end failures.

Personal experience, I used another brand in the old 5-speed transmission and not 1000mi. later experienced shifting difficulties. Shortly thereafter switched over to the Syntrax and haven't looked back. Until now.

Can't find the Syntrax locally, and 1qt. bottles on the internet are going for $25. Fortunately, I buy a couple of quarts at a time, so I still have one quart in inventory. I change my gearbox and rear-end oil every year, and continued that trend on the K1200RS.

A little trip around my local and located what appears to be the replacement, Castrol 80W-90 API GL-5. So, I bought a couple of quarts.

The basic question is, Has anyone any experience with the Castrol 80W-90 in the transmission? In the rear-end?

Thanks in advance.

-AJ
__________________
(Registered) 1998 K1200RS Marrakesh Red
Last of the '97s
Prod:WB10554AXWZA50295 05/97
See the "Marrakesh Express (Note: Pictures now at bottom of thread):" http://www.i-bmw.com/showthread.php?t=53497

'74 R90/6 -> '76 R90S -> '85 K100RT -> '98 K1200RS
Reply With Quote
  #2  
Old 05-02-2018, 12:55 AM
SKYGZR's Avatar
SKYGZR SKYGZR is offline
Twisted Wrister
Post: 780 Thanks: 2
Thanked 342 Times in 160 Posts
 
Join Date: Nov 2012
Location: Planet Earth, Milky Way, US
Re: Limited Slip Gear Oil

As an original owner (and am looking @ the original machine while typing this), of an '85 K100RS, I did eventually have a transmission failure on that machine, about 700mi away from the garage. May -or- may not have been due to tranny oil, yet when it "snapped" @ about 100mph, did get get me to the garage......although only using 5th gear...

Realize...700 mi. ...with 5th gear only.....then, picking up a nail in the nose skin, with about 450 mi to go....that right there was a ride for the ages...yet ....it got me home.

When the shop disassembled the tranny..they were shocked & amazed that it actually held together....snapped the output shaft just ahead of the main cog's engaging the lower gearing..the fifth gear remained engaged & the shattered bearing somehow kept it that way.

Their response "You were really Lucky"......my reply..."I know...how much is an new tranny gonna cost?"...

This was at about 100,000 mi....

Unsure if that actually answers your question, yet the failure really wasn't related to the oil..(yet I did notice the tranny had some "funny" shifting issues before leaving on that 2,000 mi ride....).. shifter forks were also worn, yet the bearing failure was the actual cause of the shaft's demise.

Also did have the rear drive give out on the same machine (Big Roller Bearing Failure), that's not really uncommon on machines with over 100,000 mi. Can't remember when that actually let go, yet seems it was around 130-140 or so.
__________________
"My GOD, It's Full of Stars"

As of SEPT-2018,
'85K100RS,Original Owner,DOWN@*200,620*mi
**Parked in the living room, waiting for possible restore**
'03K1200GT, 4th Owner,55,480mi. To replace the '85
**Miles Ridden since owned: 24,910
'96R1100RS,3rd Owner,80,310mi.
**Miles Ridden since owned: 49,510
'07 650 V-STROM, 2nd Owner, 38,125mi.
**Miles Ridden since owned: 10,350
Reply With Quote
  #3  
Old 05-02-2018, 01:04 AM
Beech's Avatar
Beech Beech is online now
I-BMW Rider of the Year 2016
Post: 6,658 Thanks: 1,665
Thanked 1,578 Times in 1,209 Posts
 
Join Date: Nov 2003
Location: mount vernon, WA usa
Re: Limited Slip Gear Oil

That Castrol looks good. I have about 6 gallons of Chevron Tegra SynGear 75W90 on hand, much the same. Been using it in bikes for 20 years. I noticed WalMart advertises it (The Castrol) for sale.
__________________
Beech Arriba, Abajo, Al Centro, Adentro
Mount Vernon Cannon Works
K1300S
S1000R
I need a Honda sport or better yet a Monkey
I change your tires, you buy them on the web, I do the work $40, trying to keep riders on the road.
Reply With Quote
  #4  
Old 05-03-2018, 10:24 AM
pbegin@burton's Avatar
pbegin@burton pbegin@burton is online now
A skeptic and a pragmatist.
Post: 4,332 Thanks: 60
Thanked 769 Times in 679 Posts
 
Join Date: Jun 2009
Location: Burton, BC Canada
Re: Limited Slip Gear Oil

Castrol GL5? Nothing else in BMWs since 1985.Been adding a little Moly for the last few years.

My transmission looked like new at 200,000 kms.Can't say the same about a free 98 transmission(100k?) I got a few years back,that one was just about ready to crunch but I have no idea as to how it was maintained.

Been using Castrol products for?45 yrs so not about to change.But it does look from their website that they now combined regular and limited slip oils into one?
__________________
Benelli 50cc at 14
Yamaha RD200 at 16
Yamaha RD350 at 17
Honda CB750F at 18
Honda V45 Sabre at 24
85 BMW K100RS at 28 (Very nice and sorely missed)
90 BMW R100GS at 34 (Too slow, too cranky)
2003 K1200 RS at 53 (Oh Yeah......over 6000RPM)
Reply With Quote
  #5  
Old 05-07-2018, 10:26 AM
AJ Valente's Avatar
AJ Valente AJ Valente is offline
Has gotten a ticket or two…
Post: 112 Thanks: 15
Thanked 30 Times in 16 Posts
 
Join Date: Jan 2015
Location: Claremont, NH USA
Re: Limited Slip Gear Oil

Well, somebody has to be the guinea pig, might as well be me. I'll give the new gear oil a try this season and report back on how its doing.

BTW, Moly? Isn't that the grease used for gears and such on the rear axle?
__________________
(Registered) 1998 K1200RS Marrakesh Red
Last of the '97s
Prod:WB10554AXWZA50295 05/97
See the "Marrakesh Express (Note: Pictures now at bottom of thread):" http://www.i-bmw.com/showthread.php?t=53497

'74 R90/6 -> '76 R90S -> '85 K100RT -> '98 K1200RS
Reply With Quote
  #6  
Old 05-07-2018, 10:43 AM
pbegin@burton's Avatar
pbegin@burton pbegin@burton is online now
A skeptic and a pragmatist.
Post: 4,332 Thanks: 60
Thanked 769 Times in 679 Posts
 
Join Date: Jun 2009
Location: Burton, BC Canada
Re: Limited Slip Gear Oil

Molybdenum Disulfite additive for gearboxes.Molly....
__________________
Benelli 50cc at 14
Yamaha RD200 at 16
Yamaha RD350 at 17
Honda CB750F at 18
Honda V45 Sabre at 24
85 BMW K100RS at 28 (Very nice and sorely missed)
90 BMW R100GS at 34 (Too slow, too cranky)
2003 K1200 RS at 53 (Oh Yeah......over 6000RPM)
Reply With Quote
  #7  
Old 05-07-2018, 12:43 PM
Beech's Avatar
Beech Beech is online now
I-BMW Rider of the Year 2016
Post: 6,658 Thanks: 1,665
Thanked 1,578 Times in 1,209 Posts
 
Join Date: Nov 2003
Location: mount vernon, WA usa
Re: Limited Slip Gear Oil

Some engine lube oils claim to have Molybdenum Disulfide in them. Never use them. Will turn your oil level window black , let your clutch slip if it uses engine oil and strip interior case sealers. It is a high pressure lube to deal with spot welding and the like. The correct way to use it is to clean the metal part in question with solvent and burnish in the moly paste. Most are not high % moly but you can buy it from Dow.
In general a high quality GL-5 gear oil is all that is needed. Most folks have switched to synthetic gear oils these days.
http://www.imoa.info/molybdenum-uses...lubricants.php
__________________
Beech Arriba, Abajo, Al Centro, Adentro
Mount Vernon Cannon Works
K1300S
S1000R
I need a Honda sport or better yet a Monkey
I change your tires, you buy them on the web, I do the work $40, trying to keep riders on the road.
Reply With Quote
This I-BMW member either likes, thanks -or- is 'shouting out' to 'Beech' for this post:
  #8  
Old 05-08-2018, 10:41 AM
AJ Valente's Avatar
AJ Valente AJ Valente is offline
Has gotten a ticket or two…
Post: 112 Thanks: 15
Thanked 30 Times in 16 Posts
 
Join Date: Jan 2015
Location: Claremont, NH USA
Re: Limited Slip Gear Oil

So, this year I'll be using the Castrol "Axle" 80w90 limited slip in the transmission for the first time, and see how it goes.

But, will continue to feed the rear end the Syntrax since I'm not willing to give up on proven performance in this critical area.

Also, I can tell more about a product by running it in the transmission first. If shifting becomes sluggish, etc., as with other brands, then I'll know.

Will report back at the end of the season.

-AJ
__________________
(Registered) 1998 K1200RS Marrakesh Red
Last of the '97s
Prod:WB10554AXWZA50295 05/97
See the "Marrakesh Express (Note: Pictures now at bottom of thread):" http://www.i-bmw.com/showthread.php?t=53497

'74 R90/6 -> '76 R90S -> '85 K100RT -> '98 K1200RS
Reply With Quote
Reply


Thread Tools..
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads (a database pull of similar subject matter)
Thread Thread Starter Forum Replies Last Post
Lucas heavy-duty gear oil thomasg "KRS/GT" Technical Q&A 4 08-05-2014 08:33 AM
fd gear oil change question billbeemer "KRS/GT" Technical Q&A 3 04-11-2011 12:18 PM
Gear oil change? 7R Ranch Hand "K13S/R" Technical Q&A 19 02-11-2011 10:48 PM


All times are GMT -4. The time now is 03:24 AM.


I-BMW.com is via vBulletin Version 3.5.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 1998 - 2018, I-BMW.com LLC .
Page generated in 0.68521 seconds with 16 queries