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75,000 kms on a 99 seville.
The in-dash transmission life monitor has not budged off 100% since the car was put on the road. However, there are no codes stored in any of the modules. I can't find a bulletin dealing with this either. I will be changing the transmission fluid at 83,000 kms. Anyone else with the same problem?
Just curious,

Dave :coolgleam
 

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53 Eldo, 54 CDV, 74 FWB 96 FWB (sold),1998 STS(sold), 03 ESV
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Dubya said:
95 aurora

in 2 years its stayed at 100%

i think they say change the fluid every 60k
60k miles = 100k kms
 

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Do not change that fluid! The transmission fluid in new Cadillacs are good for the life of the car. I think they started this in the mid-90's on the STS at least. You are not to change the fluid just call the dealer and ask. My 98 I had was this way and I was instructed and read some where that the tranny fluid was for the life of the car.
 

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Discussion Starter #7
My authentic GM Service Manual states (GMP/99-K-1):

Maintenance and Lubrication:

80 000 km (50,000 Miles)

-Change the automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions:

-In heavy traffic where the outside temperature reaches 32 Celsius (90 Farenheit) or higher.
-In hilly or mountaneous terrain.
-Uses such as high performance operation.

If the vehicle is not used under any of these conditions, change the fluid and filter at 166 000 km (100,000 Miles)

I have not yet seen anything on lifetime a/t fluid for the 99 seville. Is there a gm service tech on the board that could confirm this?

Dave :coffee:
 

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padosd said:
75,000 kms on a 99 seville.
The in-dash transmission life monitor has not budged off 100% since the car was put on the road. However, there are no codes stored in any of the modules. I can't find a bulletin dealing with this either. I will be changing the transmission fluid at 83,000 kms. Anyone else with the same problem?
Just curious,

Dave :coolgleam
I have a '99. It had creapt down to 98% until my firstb servicing and then has been at 100% ever since. I've asked them to fix it at the dealer but so far nothing gets done.
 

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Well I owned a 98 model and I asked the dealer about it and they told me it was good for the life of the car. I was then reading on some message boards the same thing. Here is a link were some one speaks of this also:

http://www.epinions.com/content_59809304196

I don't know about pre 98 but my car did not need it changed at all. Oh and I have a freind that still has a 98 with 100% life and around 60K miles on his car. He was told that his fluid was for the life of the car also!
 

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If the counter doesn't move after you put 100,000 on the car, just change the filter and fluid and be done with it. Since I never buy new, I change it when I get the car to be on the safe side. After all, what is the life of a car? I've seen 'em with over 100,000 on the clock and they're like new and I've also seen them with 30,000 and they look like they were used in the Battle of the Bulge.
 

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Life of the car means life of the car! If mine had around 50-60K on it and it had 100% I don't see why it would not be that way close to 100K if the car was not towing or driving up steep inclines. If you have a pre-98 model change it but if you have a 98 up don't just go to the dealer or call them and ask. If it is 98 up it may use a different type of tranny fluid than Dextron III. Look all I know is that I did not have to change mine and others were told the same thing.
 

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1992 STS / 2005 MB G500 / 2003 STS / 2006 XLR-V
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I think everyone believes what youre saying Rueben, were just asking for some sort of conclusive confirmation of this by a GM service tech or by some sort of service manual. Not having to change that fluid is all the better if that is truly the case.
 

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My 1999 SLS with 24K mile is also "stuck" at 100% tranny fluid life.

What gives?

Have any of the board's GM gurus com eup with an answer to this question?

Like most people, I am concerned about keeping lubricants and other fluids in for long intervals.

Any other thoughts on this issue?
 

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'98 STS (RIP @ 206,xxx miles)
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My '98 still indicated 100% life remaining when I changed the fluid at 125,000 miles. Twelve dollars for a case of Dexron-III is cheap insurance.
 

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JimD said:
My '98 still indicated 100% life remaining when I changed the fluid at 125,000 miles. Twelve dollars for a case of Dexron-III is cheap insurance.
Jim, I agree that it is cheap insurance. In that case, shouldn't we change it at an even earlier interval?
 

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1toycad said:
Jim, I agree that it is cheap insurance. In that case, shouldn't we change it at an even earlier interval?
I agree. It was a test of will for me to go past 100K miles on the transaxle fluid. My policy is to do preventative items before the car puts my bride to walking some dark and stormy night.

However, I do change engine oil based on the oil life monitor message (not to change the flavor of the thread).
 

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The transmission fluid in modern cars is easily good for the life of the car in normal driving. Running it to 100K is very "safe" and will cause no harm to the tranny. Tranny fluid isn't like engine oil. It's not exposed to blow by and by products of combustion. It doesn't see copius amounts of water from blowby on coldstarts. There's not much to deplete the lubricating characteristics of the tranny oil and the antiwear and special friction modifier packages are very robust and stable. The temperature of the transmission fluid is pretty carefully controlled in the cooling development for the car. About the only thing that will shorten the tranny fluid's life is excessive heat and excessive heat for long periods of time. Since the modern tranny fluid has a high synthetic content it is pretty stable even at temperatures approaching 300 degrees. So the things that govern an oil change in an engine don't apply to the transmission at all.

The transmission fluid life "counter" in the display uses the tranny temperature as a means of judging the transmission fluid's life. As long as nothing is done that the algorithm sees to shorten the life of the fluid it will stay at 100% virtually forever. If you start towing trailers or running extended heavy load operation you will see the tranny fluid life decrement fairly rapidly. If it is "stuck" on 100% then that means that the operating parameters that the PCM sees for the trans fluid have all remained well within the guidelines for life time use of the fluid. The transmission oil life monitor does not operate the same way the engine oil life monitor operates so you will typically see it stay at 100% in most cases.
 

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I have a 1997 sts & i changed my tranny fluid at 1oooo mi as said in service manuel.I changed by a transtech sysyem,it,s the only system that gets 1oo%of the old fluid out including clutch drums,shift controller & torque converter+ new filters for $140.00.I am from the old school,i dont trust life of car stuff, fluid wears out, i would rather ride then walk. DAVE!
 

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davestpierre said:
I have a 1997 sts & i changed my tranny fluid at 1oooo mi as said in service manuel.I changed by a transtech sysyem,it,s the only system that gets 1oo%of the old fluid out including clutch drums,shift controller & torque converter+ new filters for $140.00.I am from the old school,i dont trust life of car stuff, fluid wears out, i would rather ride then walk. DAVE!
Did "you" change it or did you have it changed at a shop? Not likely that you changed the filter in a 4T80E as you have to drop the transmission to get to the filter that's located in the side cover. There are two screens on the oil pickups in the bottom pan but they are not generally replaced - just cleaned of any debris. The 4T80E operates as a dry sump unit that has scavenge pumps that pick oil up from the bottom pan through the two pickups and deliver it to the side cover where it is stored. From there, the main line pressure pump picks up the oil thru the actual filter. The filter on a 4T80E is only replaced in the event of a trans failure or rebuild for some reason.

Search our archives using the search feature and type in "trans flush", "tranny flush" and/or "transmission flush" for some interesting reading. Not the most desireable thing to do given the risk of contamination from the flushing equipment.

Simply dropping the bottom pan and also draining the fluid from the side cover via the hidden drain plug under the bottom pan is plenty sufficient.
 

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Do I need to pull the trans to replace the solenoids? trans shop says they pull the trans, all the threads say you just pull the pan and be very careful. I have a '95 N* SLS 4T80E Trans.
 
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