99 STS trans fluid
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS trans fluid in Past Cadillac Vehicle Discussion; Hello everyone. Well, I'm no longer an eldorado owner. I've stepped up a bit to a 99 Seville. Just bought ...
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    93 el is offline Cadillac Owners Member
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    99 STS trans fluid

    Hello everyone. Well, I'm no longer an eldorado owner. I've stepped up a bit to a 99 Seville. Just bought it and found the trans fluid to be worn. It's not its usual bright red color and almost seems thin. It's got 121,k miles and trans life indicator is at 100% (imagine that). Should I get the fluid and filter changed anyway? I know its a dumb question, but I've been told that changing the fluid that high and bringing in new fluid will cause tranny problems sooner. So, I'm here asking the greats because I'm not a mechanic and transmissions are far out of my realm.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 99 STS trans fluid

    Spend the money at either a GM dealer or a good transmission shop and ask for a transmission fluid exchange to the new (2006) DEXRON-VI - it is 100% backwards-compatible with the obsolete DEXRON-III that came in our cars. I did my 2002 in 2007 and nary a problem.

    Remember that the 4T80E is a dry sump transmission - there will be NO FLUID on the stick with the engine OFF. Check/adjust level with the engine hot (> 10 mile drive) idling in P on a level surface.

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    stoveguyy is offline Cadillac Owners Connoisseur
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    Re: 99 STS trans fluid

    easy to check level with motor running. you remove fill port cover and look in. you can see fluid level in port. your car is 14yrs old. it could use dex6 but it will work fine with dex3 which is still easy to find. unless you go to dealer.

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    EcSTSatic's Avatar
    EcSTSatic is offline Cadillac Owners Connoisseur
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    Re: 99 STS trans fluid

    I bought my new pan gasket and Dex VI. I just need to set some time aside to drain and fill mine. There's a drain plug on the valve body that needs to be removed too according to the service manual.

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    Re: 99 STS trans fluid

    ^^^ You'll be able to change just about half of the fluid with a pan drop/side tank drain - 7 or 8 quarts.

    You can exchange about 13+ (of the 15) quarts by doing the upper cooler line pumpout method.

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    stoveguyy is offline Cadillac Owners Connoisseur
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    What brand of dex6 did u get?

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    Re: 99 STS trans fluid

    If it's labeled "DEXRON-VIŽ" it's licensed by GM (read the fine print) - all the same fluid.

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    Re: 99 STS trans fluid

    Should I get the fluid and filter changed anyway?
    There is not filter to change. Just 2 cleanable and reusable screens. Likewise the gasket is reusable.

    Personally I'd drop the pan so as to clean the magnets and any other debris that may be in there. Start the engine while the pan is down to pump out most of the rest of the old fluid (might get messy). Button it up and refill.

    ----------

    Quote Originally Posted by stoveguyy View Post
    What brand of dex6 did u get?
    I used Walmart Supertech Dexron VI. Half the price of the others.

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    stoveguyy is offline Cadillac Owners Connoisseur
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    Hmm, wmdex6 is 4.50/qt wm has good amount of trans fluid. But I do not recall seeing any other brand dex6 stuff there. I saw valvoline max life dex3 stuff but no dex6 anything

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    Re: 99 STS trans fluid

    I forgot where I priced the other brands of Dexron VI. Maybe AZ or Farm & Fleet? At any rate, they where MUCH higher than Walmarts SuperTech.

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    stoveguyy is offline Cadillac Owners Connoisseur
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    oil changes cost 80 each yr and a trans fluid swap might cost 40 which you may do every 3-4 yrs. kids vue uses t-4 toyo fluid which is 5 at toyo garage or 16 at gm garage. yep, 64 per gal at gm. u would think it was bottled french water. Or royal purple

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    EcSTSatic's Avatar
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    Re: 99 STS trans fluid

    Quote Originally Posted by Submariner409 View Post
    ^^^ You'll be able to change just about half of the fluid with a pan drop/side tank drain - 7 or 8 quarts.

    You can exchange about 13+ (of the 15) quarts by doing the upper cooler line pumpout method.
    That's my plan. I hope to get to it this weekend. Valvoline Dexron VI - $8/qt
    Right now the A/C isn't cooling so I need to put the gauges on her. Can't complain though for a '99 that has never had any cooling problems 'til now.

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    93 el is offline Cadillac Owners Member
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    Re: 99 STS trans fluid

    Wow! I've been busy all day. I come and there's 11 posts! Thanks for answering and discussing here; I've learned a bit by reading what's been said so far. I think I'm going to price fluid tomorrow here locally. Do I need a specific solution for the screens shoukder I decide to do it myself? What are the advantages of dex 6 compared to dex 3? If I go with dex 6, should I just have the dealer do a complete fluid swap?

    ----------

    *should I decide to do it myself

  15. #14
    stoveguyy is offline Cadillac Owners Connoisseur
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    Re: 99 STS trans fluid

    is price a big deal? amsoil is 11/qt. royal purple is 15. valvoline dex3 is 5. i think dealer dex6 is 9. a 2005 car has dex6. it needs dex6. your car was built with dex3. many say its ok to continue to use dex3 if you want or pay double and use dex6. it wont shift better. the most praise i hear is it wont shift worse. thats pretty damn faint praise.

  16. #15
    Submariner409's Avatar
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    Re: 99 STS trans fluid

    As in engine oil and coolant, DEXRON-VI is the latest and greatest in transmission fluid formulation. It has replaced the obsolete -III in the GM lineup and has been used since 2006.

    Is it necessary ? NO. There is a lot of -III left in the world. Is it now recommended by GM for all their cars ? YES.

    Price means nothing - if the label says something to the effect of "licensed by GM" or "DEXRON-VIŽ" then use it.

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