Q. re tranny oil at various temps

H

heinz wittenbecher

New member
Mar 1, 1998
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There was a post some time ago re how long tranny oil lasts at various
temps.

Unfortunately I can't find it.

I'm wanting to check longevity at 200 degrees of Synthetic ATF.

I'll find out more on a longer run but tranny temp at outlet was 180-190 and
in the pan about 150. No fan connected to tranny cooler yet and it was more
or less a stop and go neighborhood drive.

Brakes behaved well.

Longer test drive in a day or 2. Installing E-meter and the cable run ain't
going to be fun but worth it as it's going exactly where I want it.

Heinz
Still messin' around.
 
Is this it Heinz?

=

Date: Sat, 26 Sep 1998 02:44:17 -0700 (PDT)
From: herm beeck
Subject: GMC: ATF fluid and temp relationship

Automatic Transmission Fluid Oxidation=20
Automatic transmission fluid will provide 100,000 miles of service before
oxidation occurs under normal operating temperatures of about 170=B0F. Above
normal operating temperatures, the oxidation rate doubles (useful life of
fluid is cut in half) with each 20=B0 increase in temperature.
The approximate life expectancy at various temperatures is as follows:

175=B0F 100,000 miles
195=B0F 50,000 miles
212=B0F 25,000 miles
235=B0F 12,000 miles
255=B0F 6,250 miles
275=B0F 3,000 miles
295=B0F 1,500 miles
315=B0F 750 miles
335=B0F 325 miles
355=B0F 160 miles
375=B0F 80 miles
390=B0F 40 miles
415=B0F Less than 30 minutes=20

>There was a post some time ago re how long tranny oil lasts at various
>temps.
>
>Unfortunately I can't find it.
>
>I'm wanting to check longevity at 200 degrees of Synthetic ATF.
>
>I'll find out more on a longer run but tranny temp at outlet was 180-190=
and
>in the pan about 150. No fan connected to tranny cooler yet and it was more
>or less a stop and go neighborhood drive.
>
>Brakes behaved well.
>
>Longer test drive in a day or 2. Installing E-meter and the cable run ain't
>going to be fun but worth it as it's going exactly where I want it.
>
>Heinz
>Still messin' around.
>
>
>
 
As we all get older and fatter we all keep
forgetting things. The great thing is we all dont forget the same things.
Now think about this------with the collective knowledge here on the net
we now remember it all.

- ----

And hopefully the rememberers will continue to not mind repeat sharings with
the poor ol' rememberee :-)

Heinz
 
Hey! Remberin that I got Patrick's archives stored on my hard drive ain't
that big o deal. You can thank Patrick Flowers for the archives.

Also, you might put a bug in his ear about catchin 'em up so they'll be
current. I've bugged him too much about stuff like that already. :-)

bdub

>As we all get older and fatter we all keep
>forgetting things. The great thing is we all dont forget the same things.
>Now think about this------with the collective knowledge here on the net
>we now remember it all.
>
>----
>
>And hopefully the rememberers will continue to not mind repeat sharings with
>the poor ol' rememberee :-)
>
>Heinz
>
>
>
 
>
> Hey! Remberin that I got Patrick's archives stored on my hard drive ain't
> that big o deal. You can thank Patrick Flowers for the archives.

You're welcome!

> Also, you might put a bug in his ear about catchin 'em up so they'll be
> current. I've bugged him too much about stuff like that already. :-)

Nag, nag, nag...

Patrick
- --
Patrick Flowers
Mailto:patrick

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
> There was a post some time ago re how long tranny oil lasts at various
> temps.
>
> Unfortunately I can't find it.
>
> I'm wanting to check longevity at 200 degrees of Synthetic ATF.
>
> I'll find out more on a longer run but tranny temp at outlet was 180-190
and
> in the pan about 150. No fan connected to tranny cooler yet and it was
more
> or less a stop and go neighborhood drive.
>
> Brakes behaved well.
>
> Longer test drive in a day or 2. Installing E-meter and the cable run
ain't
> going to be fun but worth it as it's going exactly where I want it.
>
> Heinz
> Still messin' around.

Heinz,

There is some info about their synthetic ATF at the Mobil 1 web site but I
didn't store the URL.

I recall they mention less oxidation and stable higher temp operation as
selling points.

Don Miller
 
>
> There is some info about their synthetic ATF at the Mobil 1 web site but I
> didn't store the URL.
>
> I recall they mention less oxidation and stable higher temp operation as
> selling points.
>
> Don Miller
>

Thanks Don.

I'll have a dig around over there but I basically figure on using limits for
Dino Oil and then use the extra the Synthetic stuff gives ( or is supposed
to give :-) as comfort margin.

Heinz
 
Herm/Lanier:

Do you know the source for the below data you provided???

I came across this data on p 8 in the Westach (as in Westberg Mfg Inc
gauges) catalog I just received:

200 deg F 50,000 miles
250 deg F 25,000 miles
300 deg F 5,000 miles

Looks like we have at least three sets of data now. So are these =
numbers
based on any definitive research or are they "everyone for themselves"
data????

Paul Bartz

From: HLBF [mailto:HLBF]
Sent: Thursday, May 27, 1999 5:35 AM
Subject: Re: GMC: Q. re tranny oil at various temps

In a message dated 5/27/99 3:08:39 AM Central Daylight Time,

There was a post some time ago re how long tranny oil lasts at various
temps.

Heinz,

Tranny life expectancy @ various ATF temps:

175F/79C 100,000 miles
195F/91C 50,000 miles
220F/104C 20,000 miles
240F/116C 10,000 miles (varnishes form)
260F/127C 5,000 miles (seals harden)
295F/146C 1,500 miles (plates slip)
315F/157C 800 miles (seals & clutches burn out, carbon forms)

Lanier

From: Heinz Wittenbecher [mailto:heinz]
Sent: Thursday, May 27, 1999 10:21 AM
To: gmcmotorhome
Cc: Heinz Wittenbecher
Subject: Re: GMC: Q. re tranny oil at various temps

Yes, Thank you and thank you Lanier for coming to my aid.
Seems ATF change at 25000 may be deemed reasonable if temps can be kept
below 200 degrees.
Date: Sat, 26 Sep 1998 02:44:17 -0700 (PDT)
From: herm beeck
Subject: GMC: ATF fluid and temp relationship

Automatic Transmission Fluid Oxidation
Automatic transmission fluid will provide 100,000 miles of service =
before
oxidation occurs under normal operating temperatures of about 170=B0F. =
Above
normal operating temperatures, the oxidation rate doubles (useful life =
of
fluid is cut in half) with each 20=B0 increase in temperature.
The approximate life expectancy at various temperatures is as follows:
175=B0F 100,000 miles
195=B0F 50,000 miles
212=B0F 25,000 miles
235=B0F 12,000 miles
255=B0F 6,250 miles
275=B0F 3,000 miles
295=B0F 1,500 miles
315=B0F 750 miles
335=B0F 325 miles
355=B0F 160 miles
375=B0F 80 miles
390=B0F 40 miles
415=B0F Less than 30 minutes

There was a post some time ago re how long tranny oil lasts at various
temps.
Unfortunately I can't find it.
I'm wanting to check longevity at 200 degrees of Synthetic ATF.
I'll find out more on a longer run but tranny temp at outlet was =
180-190 and
in the pan about 150. No fan connected to tranny cooler yet and it was =
more
or less a stop and go neighborhood drive.
Brakes behaved well.
Longer test drive in a day or 2. Installing E-meter and the cable run =
ain't
going to be fun but worth it as it's going exactly where I want it.
 
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