Mobil 1 ATF Synthetic for clutch???

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by bikefreak47, Dec 12, 2013.

  1. bikefreak47

    bikefreak47 Adventurer

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    I stumbled across a post on another KTM (SuperDuke) site stating Mobil 1 Synthetic ATF is what the poster used as his 2008 SD clutch fluid. He stated that he's put 25,000 trouble free miles in heavy city traffic with this ATF. I've got a quart of Mobil 1 Syn ATF in my shop that I'd consider using if I can get some more positive feedback on this application. Any other KTM owners have experience with Mobil 1 ATF in their clutches?
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  2. Boatman

    Boatman Membership has it's privileges ;-)

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    Works fine. I have it in my Adv, SE (1) and Husaberg.
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  3. Off Road Ryder

    Off Road Ryder Long timer

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    Don't wait do it now. I just use the regular Tranny fluid, IMO.much better than the mineral oil.
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  4. gearheadE30

    gearheadE30 Long timer

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    Finally, a use for all these bottles of ATF that I don't have a use for! :clap
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  5. ADVill

    ADVill Been here awhile

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    To clarify, the OP is talking about the clutch master cylinder/ oil line and not the clutch itself. Sometimes things get interpreted incorrectly :)
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  6. Off Road Ryder

    Off Road Ryder Long timer

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    I understood perfectly.
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  7. Hipster

    Hipster Long timer

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    I previously used 2.5 w Motorex mineral based fork oil and the fluid would discolor and have a sludge like consistency after a few months, similar to Magra Blood. It could be the mineral based oil reacting with the Aluminum clutch reservoir?

    I've since changed to Mobil 1 synthetic ATF and so far it's holding up better than the other fluids. The clutch feel is slightly firmer with Mobil 1 ATF but, that's ok.
    #7
  8. sven520

    sven520 Adventurer

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    advice I got from Enduro Engineering was use ATF in clutch master cylinder, been doing it since 2001 no problems...:deal
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  9. jonz

    jonz Miles are my mantra

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    Works great in my SE and my 640ADV. Been using it for years now
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  10. bikefreak47

    bikefreak47 Adventurer

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    Thanks for all the feedback guys. I was concerned that there could be some negatives, like swollen seals, or seals turning to mush if I strayed from the rare as hens teeth, Magura Blood. It'll get flushed and changed in my '08 SD this spring when I regain feeling in my fingers.
    #10
  11. ADV67

    ADV67 Alsace rider

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    This subject is interesting as I have several bottles of (older) synthetic ATF in my garage and draining the mineral clutch line oil twice a year is a pain.
    Now there is ATF and ATF!

    When I look at the Castrol page there is quite a choice: :deal
    http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9047478&contentId=7081186

    Same for Mobil 1:
    http://www.mobiloil.com/USA-English/MotorOil/Other_Products/Automatic_Transmission_Fluids.aspx

    Which ATF is suitable for feeding our KTM 's? Synthetic Dexron OK or not? :kbasa
    #11
  12. crazybrit

    crazybrit Long timer

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    Mobil-1 synthetic ATF is rumored to be a slightly heavier weight than the top-secret formula that is Magura Blood. Of course you have to ask what color Magura blood are you comparing to as there are two, red and blue, sold in identical bottles :lol3 Not even Magura could tell me what the difference was.

    Use the Mobil-1, good stuff :D
    #12
  13. gearheadE30

    gearheadE30 Long timer

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    does it matter if it's type F, dextron, anything like that? I guess I don't think mine is actually synthetic, so it will continue to take up space.
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  14. Zuber

    Zuber Zoob

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    I don't like the feel of ATF, it is a little thicker (about 7 wt) than the original 'blood'. The clutch lever doesn't just snap back. I don't have any ATF sitting around.

    I've been using 2.5 wt fork oil. This system doesn't get hot, so this oil works well. I've got lots of fork oil sitting.
    #14
  15. Newbusa

    Newbusa Been here awhile

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    I also have used fork oil:D
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  16. crazybrit

    crazybrit Long timer

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    Just don't use brake fluid :D
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  17. MortimerSickle

    MortimerSickle Semi-Adventurer

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    I use only Concorso Olio Bambino.
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  18. crazybrit

    crazybrit Long timer

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    no wonder you look so ageless
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  19. Apple Jam

    Apple Jam Forest Flyer

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    It's WHERE he uses it that is his secret :evil

    I hope he keeps it a secret :1drink
    #19
  20. econwatch

    econwatch Been here awhile

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    Currently using Motorex 75. Back bled three times, used up half the bottle. Now it clunks into gear (must have gotten air in there somehow) so going to redo with some Royal Purple Max Synthetic ATF for comparison.

    http://www.amazon.com/gp/product/B000BQ78H6

    Was looking for fluid comparison info came across this --
    MolaKule posted over in bobistheoilguy
    A bit of history here.

    First, power steering fluids (PSF) and ATF's are both hydraulic fluids because they are used in specialized hydraulic systems.

    The early PSF fluids were simply mineral-based oils with a low-level phosphorous-based, or a low level of ZDDP addtives with a calcium detergent additive and anti-rust, and metal deacctivators. Specialized fricton modifiers were not needed in PS systems as they had are no friction clutches, just valves, racks, gears, seals, and hoses. Anti-oxidants of course are needed to stabilze the oil against high temperature fluid degradation.

    Notice that both PS and AT sstems are essentially closed systems that do not see any combuston gases, so the addtive package and viscosity (thickness) are very different as compared to IC motor oils.

    Modern ATF's have wet clutches, which required specialized friction additives to allow smooth shifting during clutch engagement/disengagement. Early ATF's were also mineral oils with low-levels of anti-wear additves mainly for the benefit of the sun/planetary gearing. In addition, low levels of detergents and dispersants are needed only to keep the internals clean. Anti-rust, and metal deactivators (especially the copper deactivators) are needed to keep the heat exchanger (cooler) metals from corroding. Anti-oxidants are needed here as well to stabilze the oil against high temperature fluid degradation.

    Later, it was found that ATF's could funtion well as PSF's and it also reduced dealer inventory. Any Dexron/Merc or Type-F ATF seemed to function well as a PSF.

    All was well until Honda and GM started requiring PSF formulations because of specific PS designs.

    The mineral oil based Honda PSF's required high AW additive levels because of their design or design flaws inherent in the PS design.

    The new GM PS fluid is essentially a very low detergent PSF, mineral-oil based fluid with a low level Boron/phos AW additive package.

    The Dexron VI fluid was the first low viscosity ATF fluid (6.0 cSt), but this is only the beginning. Vehicle manufacturers are now using or developing transmissons that use fluid viscosities down to 4.0 cSt or lower.

    But PSF fluids are still being specified at 7.5 cSt viscosities.


    Additives:

    http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=530321#Post530321

    Here is a companion thread:

    http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2239916#Post2239916
    #20