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Cadillac Seville / Cadillac Eldorado Forum Discussion, Change Trans fluid or not? in Past Cadillac Vehicle Discussion; For most drivers of most cars, it would just be another gauge to freak out about if it happened to ...
  1. #16
    MoistCabbage's Avatar
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    For most drivers of most cars, it would just be another gauge to freak out about if it happened to move.
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  2. #17
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    Re: Change Trans fluid or not?

    Quote Originally Posted by 1BadCadSTS View Post
    Wrong kiddo. Cycling the debris (metal) accumulated in a transmission especially for 170k is going to cause more issue then prevent.

    Ergo bad idea.

    Op drain and fill if its really bothering you but do not even consider a flush.
    ----------------------------
    Wrong kiddo
    so - let me get this right -

    MY suggestion of checking the trans fluid color - smell - and TRANS OLM -

    is WRONG?

    REALLY?

    and YOUR blanket statement of " don't change it" -
    based solely on 170K miles on the odometer -
    without any history -
    without even looking at the fluid -
    is GOOD information?

    REALLY?

    -------------
    I never suggested to flush it -

    I never suggested to exchange the fluid -

    I DID suggest to INSPECT the fluid -
    and YOU say that is WRONG -

    THAT - is BAD ADVICE -
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  3. #18
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    Re: Change Trans fluid or not?

    If you're worried about transmission fluid temperatures, there IS a transmission temp sensor in the 4T80E - it's a go/no-go affair and it turns fans on to FAST at 304 degrees - that's right - 304 degrees. Worry more about your next latte' than about transmission temperatures.

    Because the transmission fluid cooler (in these FWD cars) is in the end tank in the return (cool) side of the radiator, fluid usually runs at about 190 - 210 degrees - right where it's supposed to be (EDIT: when everything is warmed up and stabilized).

    The owner's manual gives insight for transmission fluid maintenance under different operating conditions. Transmission fluid is not subject to anything like the contamination that engine oil experiences, so transmission fluid can run for a very, very, very long time.
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  4. #19
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    Quote Originally Posted by Submariner409 View Post
    If you're worried about transmission fluid temperatures, there IS a transmission temp sensor in the 4T80E - it's a go/no-go affair and it turns fans on to FAST at 304 degrees - that's right - 304 degrees. Worry more about your next latte' than about transmission temperatures.

    Because the transmission fluid cooler (in these FWD cars) is in the end tank in the return (cool) side of the radiator, fluid usually runs at about 190 - 210 degrees - right where it's supposed to be.

    The owner's manual gives insight for transmission fluid maintenance under different operating conditions. Transmission fluid is not subject to anything like the contamination that engine oil experiences, so transmission fluid can run for a very, very, very long time.
    Holy Stuff!!! 304*!!!!
    Thanks for the good info too!!!
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  5. #20
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    Quote Originally Posted by basscatt
    ----------------------------
    Wrong kiddo
    so - let me get this right -

    MY suggestion of checking the trans fluid color - smell - and TRANS OLM -

    is WRONG?

    REALLY?

    and YOUR blanket statement of " don't change it" -
    based solely on 170K miles on the odometer -
    without any history -
    without even looking at the fluid -
    is GOOD information?

    REALLY?

    -------------
    I never suggested to flush it -

    I never suggested to exchange the fluid -

    I DID suggest to INSPECT the fluid -
    and YOU say that is WRONG -

    THAT - is BAD ADVICE -
    Title says change trans fluid or not, I made a statement on that subject not your suggestion to check the fluid. Common sense would deem you would check it every so often but since its a sealed unit (bar the dip stick) unless your leaking it or your rad side tank busted and its mixing coolant and trans fluid it should never be low. Remeber a trans doesnt use oil like a motor (especially the fwd N*s and the 3.6 nightmare motor does). Perhaps you should investigate the difference between CHANGING fluid and CHECKING fluid levels...

    Goodluck!
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  6. #21
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    Re: Change Trans fluid or not?

    Quote Originally Posted by mikec35 View Post
    My 2000 SLS has 170,000 miles and unless the previous owner changed the transmission fluid before I got it 3 years ago with 40,000 miles on it then it has never been changed. It runs great but it has been bothering me for a while as I have been thinking I should change it. I really don't trust transmission shops, I know that most jobs like fluid changes are usually given to the apprentice or green mechanics. Is it worth taking to the dealer? Are they likely to try to suck it out and replace or should I ask for them to drop the pan and clean the screen? Any advice? Thanks
    In anyone's book, 170,000 miles is a bit much, even for transmission fluid.

    A GM dealership will do a machine-operated transmission fluid exchange - all the old fluid is removed and replaced with the new recommended synthetic DEXRON-VI, in exclusive GM use since late 2006. That service is non-invasive and is usually enough for a transmission in good condition. With retail oil pricing and labor rates I would guess that service is now pushing $200 or maybe even +.
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  7. #22
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    Re: Change Trans fluid or not?

    The following is neither good nor bad information, just fact from actual observation:

    New fluid can (not will) "clean off" old, charred or brittle (from heat) clutch material. The forward clutch plates are especially prone to this as they are the hardest ones in the unit. Since there is no way to see the condition of them, it's a crapshoot.
    Will not definitely happen but possible.
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  8. #23
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    Re: Change Trans fluid or not?

    Quote Originally Posted by Aztec ETC ECS View Post
    The following is neither good no bad information, just fact from actual observation:

    New fluid can (not will) "clean off" old charred or brittle (from heat) clutch material. The forward clutch plates are especially prone to this as they are the hardest ones in the unit. Since there is no way to see the condition of them, it's a crapshoot.
    Will not definitely happen but possible.
    I have to admit. I was ready to call BS on this, but then I found this article. I try to stay open to new ideas. Maybe it's where you saw it too

    http://articles.chicagotribune.com/2...-atf-oxidation
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  9. #24
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    Re: Change Trans fluid or not?

    ^No. I am inside transmissions every day and have seen it for myself.

    ('92 Aerostar trannies were blown up from the factory.)
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  10. #25
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    Re: Change Trans fluid or not?

    Quote Originally Posted by EcSTSatic View Post
    I have to admit. I was ready to call BS on this, but then I found this article. I try to stay open to new ideas. Maybe it's where you saw it too

    http://articles.chicagotribune.com/2...-atf-oxidation
    I used to read Weber's articles every week and while fairly informative, I have learned that he is not always correct. For instance, he says "ATF is supposed to get no hotter than 175 degrees Fahrenheit". Now we all know that's wrong. Pretty sure transmission operating temps are much higher. Hell, the 4T80E doesn't even trigger the cooling fans until the trans gets to 304. Take Weber with a grain of salt.
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  11. #26
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    Re: Change Trans fluid or not?

    I called the Dealer, the service advisor suggested dropping the pan and changing the fluid, he advised against exchanging the fluid, said with high mileage the pressure changes created when exchanging the fluid could be harmful. They want $210. I might let them do it so they can check and advise on my oil leaks as well.... Thanks for the replies..
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  12. #27
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    Re: Change Trans fluid or not?

    $210 sounds a bit high.
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  13. #28
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    Re: Change Trans fluid or not?

    Mercon VI is about $9/qt at the parts stores. What does the dealer charge? Shouldn't be more than an hour of labor, if that.
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  14. #29
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    Re: Change Trans fluid or not?

    The Tech Tips section has a post about so called "transmission flush" procedures. There is no such thing in the factory service manual. It could (and has) throw metal debris into filters and valves causing premature failure.

    The proper way to service the fluid in the transaxle is to drain and refill. There are a couple of filters that are reusable as well as a hidden plug.
    Alternatively, some (including myself) have used the trans pump to pump out the fluid using a hose and a bucket. After that, one could lift the car and undo the trans bolts and pour the remainder of the fluid like oil. Clean the filters... then refill with fresh fluid (Dexron VI) the same amount that came out!
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  15. #30
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    Re: Change Trans fluid or not?



    Quote Originally Posted by 1BadCadSTS View Post
    Title says change trans fluid or not, I made a statement on that subject not your suggestion to check the fluid. Common sense would deem you would check it every so often but since its a sealed unit (bar the dip stick) unless your leaking it or your rad side tank busted and its mixing coolant and trans fluid it should never be low. Remeber a trans doesnt use oil like a motor (especially the fwd N*s and the 3.6 nightmare motor does). Perhaps you should investigate the difference between CHANGING fluid and CHECKING fluid levels...

    Goodluck!
    -------------------------------
    Title says change trans fluid or not,
    I made a statement on that subject not your suggestion to check the fluid.

    that is NOT what you did -

    your first response was #2 - a blanket statement of "DO NOT TOUCH IT" -
    based solely on the odometer reading of 170K miles -

    the OP stated he has had the car for 3 years -
    and has put 30K miles on it - and has no history of maintenance -

    using that information - I simply suggested he take a look at the fluid -
    who knows -
    MAYBE the previous owner had the trans fluid replaced at some time -

    and YOU responded - in #11 - QUOTING MY RESPONSE -
    that I was WRONG -

    "Wrong kiddo" . . . . .
    now - I COULD be wrong -
    but I interpreted your response starting with "WRONG KIDDO" -
    as you disagreeing with my suggestion
    of checking the condition of the trans fluid -
    and the looking at the TRANS OLM -
    BECAUSE - THAT'S ALL I SUGGESTED -

    Perhaps you should investigate the difference between
    CHANGING fluid and CHECKING fluid levels...

    NO ONE in this entire thread even mentioned
    checking fluid level -
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