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  1. #1
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    Reusing (Shimano) mineral oil, is it ok?

    My 2 bikes have both shimano hydros (xt's); one set needs bleeding and I'm going to use pentosin.

    Anything against saving the shimano oil for later use on the other set?

  2. #2
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    The safe answer is no, don't reuse the mineral oil. However, I've done it, and haven't had any problems. The oil that I reused didn't have a lot of hours on it though.

  3. #3
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    Quote Originally Posted by dblspeed
    My 2 bikes have both shimano hydros (xt's); one set needs bleeding and I'm going to use pentosin.

    Anything against saving the shimano oil for later use on the other set?
    I wouldn't... you probably bought the pentosin by the quart or liter or whatever, so you should have a lifetime supply...

    DOT brake fluid absorbs moisture, which is why it doesn't last long once it is opened.... not sure about mineral oil... if it DOESN'T absorb moisture and you can keep it clean I suppose it wouldn't be the worst thing ever.

    But I still wouldn't do it.
    You better just go ahead and drop that seatpost down to the reflector... the trail gets pretty rough down there.

  4. #4
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    Correct, mineral oil does not absorb moisture. The issue would be if the oil was dirty or contaminated somehow.

  5. #5
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    Absolutely not. Your brake system is made up of tiny precision parts. Its biggest enemy is contamination. What does new oil cost? A dollar? Two dollars?

  6. #6
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    Would you reuse toilet paper?

    = )

    I wouldn't save it....and I'm a packrat.
    Look, whatever happens, don't fight the mountain.

  7. #7
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    I gotcha, I'm not going to re use it.
    The oil is only less than 2 months old and I though it was worth an e-try.

  8. #8
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    Quote Originally Posted by dblspeed
    My shimano hydros (xt's) need bleeding and I'm going to use pentosin.
    Is this a cheaper option to using Shimano brand oil from a bike shop? Could generic mineral oil from a grocery store be used?
    Keep the Country country.

  9. #9
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    Quote Originally Posted by Lelandjt
    Is this a cheaper option to using Shimano brand oil from a bike shop? Could generic mineral oil from a grocery store be used?
    Not a good idea except in an emergency... you want hydraulic mineral oil, which is what pentosin's product is. I am no expert, but I've heard the stuff from the grocery store is significantly different.
    You better just go ahead and drop that seatpost down to the reflector... the trail gets pretty rough down there.

  10. #10
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    So is Pentosin commonly found at hardware stores?
    Keep the Country country.

  11. #11
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    Quote Originally Posted by Lelandjt
    So is Pentosin commonly found at hardware stores?
    It is more of an automotive product-you might find it at a volvo, VW, BMW dealership from the parts dept (it was used on some european cars as power steering fluid)... I got mine through mail order. The nice thing was that I got a liter for like 12 bucks, which is basically a lifetime supply.
    You better just go ahead and drop that seatpost down to the reflector... the trail gets pretty rough down there.

  12. #12
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    Quote Originally Posted by Lelandjt
    So is Pentosin commonly found at hardware stores?
    there are 2 kinds of pentosin, you have to use the chf 7, the green one, the other kind will damage the seals. there is also a substitute which is what I use, it's also green, but I can't remember the name right now. if you do a search on pentosin they will both pop up

  13. #13
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    thanks
    Keep the Country country.

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