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Top fluid question..

This is a discussion on Top fluid question.. within the Convertible forums, part of the Vehicle Specific category; What kind of fluid do you put in the pump for the convertible top? I was thinking hydraulic, or transmission ...

  1. #1
    Impounded LS1 Trans am's Avatar
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    Top fluid question..

    What kind of fluid do you put in the pump for the convertible top? I was thinking hydraulic, or transmission fluid? Hope somebody knows, mine is getting low.

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    1995 Firebird Conv.

    Use Mineral Oil. I haven't had a problem with it yet.

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    wheres the pump located to check the fluid

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    Quote Originally Posted by charlesss View Post
    wheres the pump located to check the fluid
    opposite side of the spare tire. you'll find a little opening... pull on the trap door and you have access to the hydraulics.
    Eugenio_SS
    almost stock triple-black 2000 SS convertible with 17x11s on all 4 w/ 315s at the track or on the street with 18x10.5s on all 4 w/ 315s: (1), (2)

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    Quote Originally Posted by Eugenio_SS View Post
    opposite side of the spare tire. you'll find a little opening... pull on the trap door and you have access to the hydraulics.
    Thanks.. I knever new they had to be topped up

  6. #6
    Impounded LS1 Trans am's Avatar
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    Mineral oil? WTF is that? You sure that is what to use, and where do I get that at?

    Quote Originally Posted by Hotwheels Camaro View Post
    Use Mineral Oil. I haven't had a problem with it yet.

  7. #7
    Member LS1Z28's Avatar
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    Quote Originally Posted by LS1 Trans am View Post
    Mineral oil? WTF is that? You sure that is what to use, and where do I get that at?
    Any supermarket or drug store. GM changed to mineral oil because the hydraulic fluid was eating the seals. I've had it in my car since 1999 with no problems to date.

  8. #8
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    Quote Originally Posted by LS1Z28 View Post
    Any supermarket or drug store. GM changed to mineral oil because the hydraulic fluid was eating the seals. I've had it in my car since 1999 with no problems to date.
    Correct. Mineral oil is used as a laxative, you'll find it next to ExLax.

    I've switched to mineral oil too, but I've yet to see anything "official" from GM in writing that states this, so I'm going off of the trust I have for my fellow LS1.com'ers.

    Johnny B - '98 "Triple Black" WS6 Convert, M6, All Options, ASC #3030 (1 of 50)
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  9. #9
    Impounded LS1 Trans am's Avatar
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    If you guys say so.. So should I drain what fluid is in there and put straight mineral oil in or not and If so How do I drain it? Thanks guys..

  10. #10
    Orig Regist: 9/98
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    Quote Originally Posted by LS1 Trans am View Post
    If you guys say so.. So should I drain what fluid is in there and put straight mineral oil in or not and If so How do I drain it? Thanks guys..
    Well, to get ALL of the old fluid out so that you have a 100% mineral oil fill, you'd probably have to disconnect all the hoses, blow them out and manually cycle the cylinders. This sounds difficult and messy, probably not worth it. I just topped off my fluid w/ mineral oil and left what was left of the old stuff (probably Dextron III) in there. Mine still has a slow leak, so the mineral oil didn't help or hurt that, but at least the pump and cylinders are still fine, just need to keep it topped off.

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