Clutch Fluid - - Excellence in Motion
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post #1 of 7 (permalink) Old May 16th, 2014, 9:51 pm Thread Starter
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Location: Duncan, OK, USA
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Clutch Fluid

What do you use for clutch fluid? It says on cover of reservoir use only mineral oil......
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post #2 of 7 (permalink) Old May 17th, 2014, 11:27 am
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Just what it says, mineral oil, Not DOT brake fluid! There is no reason to change it as it does not eventually absorb water like brake fluid unless there is a leak.

Marin Phil
2013 K13S-Anniv ED
'06 K12GT Blue of course!_Sold-too many problems
'05 Ducati 999-My Italian Mistress_sold and missed
2004 K12 GT-Orient Blue-the new me.-Sold
about 30 before that but too old to remember them all..
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post #3 of 7 (permalink) Old May 17th, 2014, 11:44 pm
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Check this thread for discussion on this very topic.

The short answer is that it's supposed to be a lifetime fill (never needs changing) because it doesn't absorb water like hydraulic brake fluid. But some guys still like to change it out every year or two years. It's not that difficult, or really all that expensive, but whether it's worth your time and trouble for some possibly unnecessary piece of mind is up to you . . .

And yes, it's Mineral Oil (available at your friendly local BMW dealer), not Dot 4 (or even DOT 5) brake fluid.

Pacific NorthWet
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
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post #4 of 7 (permalink) Old May 18th, 2014, 1:51 am
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Originally Posted by pmorritt
Just what it says, mineral oil, Not DOT brake fluid!
If the clutch is designed for Mineral you must use mineral. Brake fluid will quickly cause major issues with the seals etc. The link to the other thread is good info. After reading that I may change my clutch fluid since I am keeping the bikes long term. I have done everything else including a preventative FD tear down on the 09 K13GT to check the U joints and lube the splines.

2009 K13GT (new to me in 2013)
2011 R1200GSA yellow beast
2005 KLE500 (Hong Kong)
2012 S1000RR (sold for K13GT)
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post #5 of 7 (permalink) Old May 18th, 2014, 2:09 pm
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The good news about the mineral oil is that it does not deteriorate like brake fluid and thus changes are not really needed. As long as the level is good, it should be fine. Brake fluid is subjected to much more heat from the brake calipers and tends to absorb moisture over time which is why it needs to be changed regularly.

Ed Miller,
Calgary, AB, Canada
2008 K1200GT, 2009 F800GS
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post #6 of 7 (permalink) Old May 18th, 2014, 3:10 pm Thread Starter
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Location: Duncan, OK, USA
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Thanks for info. My problem is the closes BMW dealer is three hours away.

BMW told me that Ktm dealers carry a good clutch fluid that would work also. We have a lot of Ktm dealers around compared to BMW dealers. BMW dealers are a endanger species in Oklahoma.
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post #7 of 7 (permalink) Old May 18th, 2014, 6:59 pm
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And, a lot of KTM owners put Automatic Transmission Fluid..

More temperature stable and resistant to oxidation that mineral oil seems to support. If you leave mineral oil in the clutch system for a long time it seems to get a black residue of aluminum oxide. I always flush the clutch mineral oil once a year in the KTM, but never have in the BMW..
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