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MTF drain = chocolate milk #5357686 02/22/20 11:02 PM
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Texasdoc Offline OP
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I have a TKO 600 with no external coolers/pumps, etc. It has about 4000 miles total on it - weekend/sunny day car only. I have run it pretty hard on the track a handful of times (maybe 6 days over the last 3 years). After the initial break-in, I changed the oil to Valvoline MTF. The manual calls for ATF for the 1st 500 miles, then GM Synchromesh and Valvoline was what O’Reilly had. The bottle says it is compatible with the GM stuff.

Over the last few weeks my tranny has been hard to get into gear. Any gear. (I know, I need to check the clutch disengagement). Anyway, I decided to change the oil. The tranny is known for its notchy shifting and I have a buddy who raves about Amsoil, so I figured I’d try it. When I drained the old Valvoline stuff out, it looked like chocolate milk. It was still pretty thick and I didn’t see much particulate material (I didn’t look that closely at the time). It didn’t smell burnt. I don’t have any other fluids that can get in there. No water/antifreeze/motor oil, etc has access to the tranny. It is just a self contained unit. It has not been out in the rain - no way for water to get inside.

Would the residual ATF left in the case after draining, mixed with Valvoline MTF cause a chocolate milk appearance?

I haven’t put the Amsoil MTF in yet. I hate to “waste” $20/qt Amsoil if I will need to drain and fill again in xxx miles. Should I fill it with cheaper MTF or other gear lube, run it for 100 miles, then D/F with Amsoil?

Any other thoughts?

Re: MTF drain = chocolate milk [Re: Texasdoc] #5357692 02/22/20 11:14 PM
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AC1DD Offline
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Factory told you GM synchromesh and you used valvoline mtf. which specific product
?

Last edited by AC1DD; 02/22/20 11:16 PM.
Re: MTF drain = chocolate milk [Re: Texasdoc] #5357703 02/22/20 11:33 PM
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4WD Online Confused
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Valvoline Synchromesh is what, $10/quart … Can you run one bottle through with plugs out before the AMSOIL?

Redline MTL is also popular for synchromesh applications

Re: MTF drain = chocolate milk [Re: AC1DD] #5357722 02/22/20 11:57 PM
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Texasdoc Offline OP
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Originally Posted by AC1DD
Factory told you GM synchromesh and you used valvoline mtf. which specific product
?


How, exactly, does this help? The FACTORY didn’t tell me anything. The AUTHORIZED TREMEC Dealer I bought the thing from said the Valvoline was ok. Even Tremec can’t decide what version of GM synchromesh to use, every website you visit gives you a different answer. Sometimes Tremec recommends GM 12345349, sometimes ATF, sometimes Dexron III - they don’t make that anymore, sometimes ATF then synchromesh. — So I went with the Valvoline MFT Synchromesh that says it is compatible. Again, how does this help the current problem?

Originally Posted by 4WD
Can you run one bottle through with plugs out before the AMSOIL?


Yeah, good idea. I may even have a bottle sitting around. Plug the drain, put in a quart, spin it around a bit, let it sit, then drain it.

Last edited by Texasdoc; 02/23/20 12:00 AM.
Re: MTF drain = chocolate milk [Re: Texasdoc] #5357742 02/23/20 12:35 AM
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AC1DD Offline
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Originally Posted by Texasdoc
Originally Posted by AC1DD
Factory told you GM synchromesh and you used valvoline mtf. which specific product
?


The FACTORY didn’t tell me anything. The AUTHORIZED TREMEC Dealer I bought the thing from said the Valvoline was ok. Sometimes Tremec recommends GM 12345349,


Never count on a dealer to be competent. You mentioned here that tremec said use GM fluid.
Use that GM fluid the factory calls for.

Last edited by AC1DD; 02/23/20 12:36 AM.
Re: MTF drain = chocolate milk [Re: Texasdoc] #5357747 02/23/20 12:56 AM
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oldhp Offline
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TREMEC now makes there own fluid for their transmissions. Give them a call.


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
"When others cut you down, remember where they came from."
"I don't run...........I just wait"
Re: MTF drain = chocolate milk [Re: Texasdoc] #5357781 02/23/20 04:24 AM
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montero1 Offline
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I'd use Mobil 1 Synthetic ATF. I see nowhere on their website that calls for MTF of any kind.


https://www.tremec.com/faqs.php

Last edited by montero1; 02/23/20 04:28 AM.

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Re: MTF drain = chocolate milk [Re: Texasdoc] #5357785 02/23/20 04:28 AM
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Olas Offline
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drain and fill with cheap stuff. repeat until no more milkshake comes out.
fill with the appropriate Redline or Schaeffers product (they are world leaders in gear oils)

Re: MTF drain = chocolate milk [Re: Texasdoc] #5357799 02/23/20 06:09 AM
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zeng Offline
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cholocate milk is surely water contamination in thousands of ppm .
I hear you discounting such .

Re: MTF drain = chocolate milk [Re: Texasdoc] #5357801 02/23/20 06:32 AM
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demarpaint Offline
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I'd say water is finding its way into the transmission. I'd get the spec'd fluid, drain the unit, drive it a bit and repeat. Look for possible water entry points. Then drain and check the fluid condition in a thousand miles. After that keep an eye on it to see if it is changing color after some heavy rain storms. You can do that by extracting or draining a small sample and topping it off.


God Bless Our Troops

Re: MTF drain = chocolate milk [Re: Texasdoc] #5357810 02/23/20 07:24 AM
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Mr Nice Offline
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What vehicle is this ?

I would only the Manufacturer spec fluid for now.

Re: MTF drain = chocolate milk [Re: Mr Nice] #5357859 02/23/20 08:30 AM
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Texasdoc Offline OP
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Originally Posted by Mr Nice
What vehicle is this ?

Originally Posted by zeng
I hear you discounting such .


It is a kit cobra. Its not even driven thru puddles, much less in the rain. I just don’t see how it can be water.

Originally Posted by montero1
I see nowhere on their website that calls for MTF of any kind.


Except now they even recommend their own MTF - specs say it is a GL-4 75W-85 gear oil (whatever that means).
Tremec MTF

Re: MTF drain = chocolate milk [Re: Texasdoc] #5357867 02/23/20 08:44 AM
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Olas Offline
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trans-fluid cooler built into the radiator would allow water ingress and mixing if it were faulty. Failed water/oil heat exchangers make people think theyre HG is failing, similar effect is in play here maybe?

Re: MTF drain = chocolate milk [Re: Texasdoc] #5357878 02/23/20 09:00 AM
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I had a pickup with a new venture 3500 transmission that called for gm synchromesh fluid.
The trans was a bit worn out and the shifting was notchy. I tried the Gm fluid, Pennzoil synchromech, and Amsoil synchromesh. The shifting was noticably better with the Amsoil fluid than the other 2.

As far as the milky look, it is normally moisture, although I guess it could possibly be from mixing 2 different fluids.
If there is a vent on top of the transmission, I would make sure moisture isnt making its way in that. Like if there is a vent nipple that needs a hose attached to it, or ac condensate water isnt running down near the vent.
I would probably get some of the cheaper valvoline or Pennzoil fluid, and put that in as a flush and drive it for 50-100 miles to get it hot and dump it. Then install the Amsoil fluid.


2008 Ford F350
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Re: MTF drain = chocolate milk [Re: Texasdoc] #5357961 02/23/20 10:38 AM
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oilpsi2high Offline
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OP my Cobalt SS had milkshake MTF when I did the first change around 30,000 miles. That was ten years ago or so. I’m at 150,000 miles now.

I’m not sure what causes it. The OEM fluid is dark red btw. My guess would be moisture easily getting in through a vent, coupled with wear material and just age.

Not being able to go into gear is concerning. Did a fluid change fix that? I’d start by finding out what the proper fluid is for your trans and then doing a drain and fill with that. Check the drain plug magnet for shavings - install one if you don’t have one.


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