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PostPosted: Mon May 26, 2008 5:32 pm 
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Location: Eugene
What is the thinnest transmission fluid that will work in a 3cyl geo? I am running the full synthetic 75W80 GM fluid that is meant for the car currently. I wonder if going to 0W20 mobil 1 motor oil may increase miles per gallon.

I do not want to ruin the transmission or syncronizers so I ask if anyone else has tried thin fluid in a 1.0.


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PostPosted: Mon May 26, 2008 5:39 pm 
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whoa, 0w20 are you kidding me. no dont do that

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PostPosted: Mon May 26, 2008 8:27 pm 
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Use Syncromesh oil in that transmission. It's thin enough for economy, but not too this to cause damage....................

GM, Pennsoil, and other companies make it...............

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PostPosted: Mon May 26, 2008 10:03 pm 
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whats its weight equivalent to?

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PostPosted: Wed May 28, 2008 2:25 pm 
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Location: Eugene
I see it is equivalent to 80W gear oil according to the following website: http://www.stealth316.com/2-pennzoil-synchromesh.htm



That is thicker than what I already have in the transmission currently.

Has anyone actually used syncromesh in a geo? According to the following link 80W gear oil is close to a 30W motor oil. So a 0W20 may not be all that far off from 75W80 gear oil.


http://www.bobistheoilguy.com/visc.html


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PostPosted: Wed May 28, 2008 2:29 pm 
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Location: Southern Oregon
you could use the RP Synchromax. it claims to be a replacement for the synchromesh fluid... but unlike the synchromesh (and pennzoil and amsoil alternatives) has a lower cst @ 1000 (as was pointed out to me on another forum). the rp cst is 7.7. the cst for the others is between 9 and 9.9 (depending on which one you use).

what this means is that while the RP claims to offer the same level of protection and lubrication as the others... it's thinner in viscosity.

cost me about 9 bucks a bottle. i wasn't aware of the cst numbers before i got it though... and i can't yet comment on any mpg savings as i just put it in a week ago.

hope that helps!


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PostPosted: Wed May 28, 2008 10:01 pm 
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Location: Port Orchard, Washington USA
I've read that Suzuki recommend ATF for the manual transmission and further that several of the high MPG guys are using Synthetic ATF

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PostPosted: Thu May 29, 2008 12:40 pm 
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you know you should really think about this too. Why not use lighter oil in the engine too then?

The transmission needs thick lubricant for a reason usually. I actually lolled at the 0w20 oil in the transmission. Maybe drop 5 or 10 weight tops, but im using recommended fluid, these transmissions (atleast the gti ones) are getting more and more scarce

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PostPosted: Wed Jun 04, 2008 3:02 am 
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Don't forget 2 very important properties that Syncromesh has over motor oil.

1) High pressure detergents, standard motor oil uses detergents that carbonize under high pressure and become a sand like substance in the oil.

2) The friction modifiers in Syncromesh are completely different from LSD additives, your standard engine oils won't have these either.

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PostPosted: Thu Jun 05, 2008 2:22 pm 
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for what its worth, im doing a tranny swap and I picked up 3 bottles of castrol 75w90 synthetic gear oil. and its what I plan on putting in it. it was late and it was all that was open at the time, and its what I used last time too

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PostPosted: Thu Jun 05, 2008 2:28 pm 
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Location: so. in.
swift13b wrote:
for what its worth, im doing a tranny swap and I picked up 3 bottles of castrol 75w90 synthetic gear oil. and its what I plan on putting in it. it was late and it was all that was open at the time, and its what I used last time too

what does the factory call for ?????


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PostPosted: Thu Jun 05, 2008 11:42 pm 
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Location: Brentwood, CA
I agree that trans oil selection is science... go with the GL the manufacturer recommends (unless u race and your trans builder has lots of experience) I drove a couple of Metros with compromised 2nd gear syncro's (common?). I understand synco operation and longivity is oil chemistry dependant.


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PostPosted: Fri Jun 06, 2008 11:29 am 
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COMP wrote:
swift13b wrote:
for what its worth, im doing a tranny swap and I picked up 3 bottles of castrol 75w90 synthetic gear oil. and its what I plan on putting in it. it was late and it was all that was open at the time, and its what I used last time too

what does the factory call for ?????

75w/90

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PostPosted: Fri Jun 06, 2008 11:36 am 
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Location: so. in.
swift13b wrote:
COMP wrote:
swift13b wrote:
for what its worth, im doing a tranny swap and I picked up 3 bottles of castrol 75w90 synthetic gear oil. and its what I plan on putting in it. it was late and it was all that was open at the time, and its what I used last time too

what does the factory call for ?????

75w/90

thats what i thought,,thanks


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PostPosted: Fri Jun 06, 2008 12:01 pm 
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Location: Palm Springs: Too hot from June to Oct.!
Synchromesh is 5W-30:
viewtopic.php?f=30&t=34517&p=260336&hilit=+best+trans+fluid#p260336

A thread on which transmission fluid to use:
viewtopic.php?f=9&t=32690&p=251509&hilit=+best+trans+fluid#p251509
One of our foremost internet experts...white turbo sprint in his avatar...comments.
Thread addresses synchromesh vs. 75-90.

This one's worth reading. It gets a little technical at the end:
viewtopic.php?f=9&t=27939&hilit=+best+trans+fluid

Mobil One took out my synchros, anyone???
viewtopic.php?f=9&t=25244&p=194209&hilit=+best+trans+fluid#p194209

Of all the threads I've read, maybe this one says it best, and the reply is from someone who rarely (if ever) gets contradicted:
viewtopic.php?f=14&t=23496&p=181529&hilit=+best+trans+fluid#p181529

If you are bored, here's some more reading:
viewtopic.php?f=5&t=18548&hilit=+best+trans+fluid

No matter what you use, if you loan your car to your roomate, or drive like crazy, you could end up with this:
viewtopic.php?f=9&t=9324&hilit=+best+trans+fluid
(I know, you resent that... :D :D :D )

Back in 2003, we had a little different consensus:
viewtopic.php?f=22&t=500&p=6660&hilit=+best+trans+fluid#p6660

And in 2002, they were talking about block heaters and mustard...
viewtopic.php?f=9&t=2198&p=19932&hilit=+best+trans+fluid#p19932

By the way, thanks to Johnny Mullet for the pictures.
His information is quite verifiable, but the links to do it are on a computer hard drive which has long ago bit the dust.

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PostPosted: Fri Jun 06, 2008 3:54 pm 
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swift13b wrote:
COMP wrote:
swift13b wrote:
for what its worth, im doing a tranny swap and I picked up 3 bottles of castrol 75w90 synthetic gear oil. and its what I plan on putting in it. it was late and it was all that was open at the time, and its what I used last time too

what does the factory call for ?????

75w/90



Only it it's neg 30C outside, 80w-90 is the factory recommended weight for most climates.


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PostPosted: Fri Jun 06, 2008 4:41 pm 
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I doubt that 5weight difference really matters, according to the original post, using 75w90 IS the thinner transmission fluid

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PostPosted: Tue Jun 10, 2008 4:17 pm 
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Location: Brentwood, CA
The GM Sycromesh transmission lube that I just bought from the dealer ($9.50/qt. BTW) pours and feels MUCH thinner (at room temp) than the usual sulfur-smelling honey-like 75w-80 stuff I dump into aircooled vw transaxles. The GM stuff must already be taylored for better FE.


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PostPosted: Tue Jun 10, 2008 8:41 pm 
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You're right metromizer, Synchromesh is the thinner, better smelling, high mpg fluid that the factory put in there. Recommended is 75 - 90 OR Synchromesh, Synchromesh is the better choice. My Suzuki Aerio has 75 - 90 recommended, the dealer put in 80 - 90 and it didn't want to go into gear if the temperature was below 40 degrees. It was a huge difference when cold.

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