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Old 06-09-2008, 07:08 PM   #1
tobylazur
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Default trans fluid

So what is the recommended fluid these days? I just read about 40 pages worth of the scotty's cocktail thread, and I can't make heads or tails of it. I've seen in that thread people discussing transfluid, diff fluid, synthetic, non-synthetic, etc etc. Some love one thing, other people say the best is something else, still other people are telling those people they are idiots because their said fluid is going to grenade their tranny.

What fluid should I be using in my higher mileage 02 manual trans? It is already grinding going into 4th. Seems like either my trans is way screwed, or a different fluid might help it not grind so much. Please school me gurus.
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Old 06-09-2008, 08:50 PM   #2
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Motul 300 or Redline lightweight shockproof...pricey, but they will fix your syncho ills and be 100% perfect.
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Old 06-09-2008, 10:45 PM   #3
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^What he said.

Mix them both 50/50.

I use it and luv it!
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Old 06-10-2008, 05:33 AM   #4
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Quote:
Originally Posted by steeter View Post
^What he said.

Mix them both 50/50.

I use it and luv it!

mix them both, why? why not just run straight motul 300? i dont see the reason for mixing fluids
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Old 06-10-2008, 08:32 PM   #5
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If Red Line Lightweight ShockProof is so great for our transmissions, why does it state,

Quote:
Originally Posted by Red Line Synthetic Oil Corporation
not recommended for most syncro-type transmissions
on their website?

It seems like the 75W90 NS is a better choice. What gives?
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Old 06-09-2008, 11:51 PM   #6
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motul 300 is really good..
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Old 06-10-2008, 09:17 PM   #7
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tobylazur:

Just my humble opinion but I would not EVERmix ANYfluids together!-!-! I use Amsoil SVG 70W-90 Gear Lube w/ good results.

Regards,
~Button
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Old 06-10-2008, 09:48 PM   #8
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Quote:
Originally Posted by Button View Post
tobylazur:

Just my humble opinion but I would not EVERmix ANYfluids together!-!-! I use Amsoil SVG 70W-90 Gear Lube w/ good results.

Regards,
~Button
yea, me either. I'm gonna check out that motul stuff. Thanks guys.
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Old 06-10-2008, 10:01 PM   #9
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Quote:
Originally Posted by Button View Post
tobylazur:

Just my humble opinion but I would not EVERmix ANYfluids together!-!-! I use Amsoil SVG 70W-90 Gear Lube w/ good results.

Regards,
~Button
Your strong feelings towards not mixing fluids are ill-guided. MANY people have been running various mixes of gear oils with no ill effects. Furthermore, Red Line confirms compatability:

from Redline LW shock proof page

Quote:
Compatible with petroleums and synthetics
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Old 06-11-2008, 05:15 AM   #10
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DUB03REX,

please read post #6, lightweight shockproof is not recommended for most syncro-type transmissions! yes the shockproof stuff is compatible with petroleums and synthetics, but it is not recommended by redline for syncro-type trannys which we have. why would you mix a tranny fluid which is not a GL-5 type fluid, lightweight shockproof, and dump it into our trannies in the first place? it just doesnt make sense to me, but please clarify your stance.
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Old 06-11-2008, 08:38 AM   #11
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You kids and your degrees in tribology.....

Look, what Redline says, what Motul says, what Uncle Scotty says....it all means nothing. I've seen and talked to all the big names in the tranny industry and see the posts here for the last 38 years and here is the conclusion if you believe it or not:

Use what you want. The biggies are:

Motul 300
Redline lightweight shockproof
Uncle Scotty's cocktail

Try one and see how you like it. It may work for you, it may not.

Excuses:

Well it's the wrong oil weight.
Well Redline says not to use in a synchro tranny.
Well it's not API certified.
Well it's the wrong color.

Guess what? Take your excuses and stick them in your bee bonnet as we don't care. There are many users here that have used, with great success, the "wrong fluid". Now if you want to "internet engineer" the "wrong fluid" users into changing to the right fluid, you will fail, so quit it already. The bottom line is your tranny may or may not like certain fluids and NO ONE on here has a perfect solution, only options to try.
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Old 06-11-2008, 01:14 PM   #12
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Default

^^ fluids will not fix your syncro issues.

Basic chemistry teaches you that mixing fluids is not a good idea.

Run the Motul Gear 300 / Subaru Extra-S / Valvoline 75w90 / Amsoil Severe Gear 75w90

Stay away from Syncromesh / Redline 75w90NS / any ATF based fluid / USC cocktail


-Dylan
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Old 06-11-2008, 06:02 PM   #13
tobylazur
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Quote:
Originally Posted by DS1 Motorsports View Post
^^ fluids will not fix your syncro issues.

-Dylan
But will it mask them for a few more thousand miles?
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Old 06-11-2008, 11:04 PM   #14
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Quote:
Originally Posted by 03silvsubie View Post
DUB03REX,

please read post #6
Did you happen to notice who wrote post #6?
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Old 06-11-2008, 11:30 PM   #15
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hands down AMSOIL tranny fluid period.
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Old 06-12-2008, 02:23 AM   #16
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its tranny fluid, what makes one noticably better than another? smoother shifts? from the drivers standpoint how could you tell?
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Old 06-12-2008, 03:27 AM   #17
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Quote:
Originally Posted by pearljam11 View Post
its tranny fluid, what makes one noticably better than another? smoother shifts? from the drivers standpoint how could you tell?
Quote:
Originally Posted by DS1 Motorsports View Post
^^ fluids will not fix your syncro issues.
To provide feedback on both the above:

My OEM 5MT gearbox didn't like going into first gear. I had issues after swapping the fluid from OEM to Mobil1 to OEM. No joy in first gear until the car was nearly stopped. I then talked to Andrew of Andrewtech fame and he was told to try 100% Redline lightweight shockproof. This advice was given to him by Simon Pfitzner, the P in PPG. Andrew had great success and said this fluid swap alone saved a customer ~$1000 or so in swapping out synchros. So I tried it and was immediately able to downshift into first gear at speeds up to 25 MPH. So fluid swaps show their benefit by easier synchro engagement. I've seen it, and have reported my findings above based on why I did what I did...by basing my decision on the decisions of others. I've also seen people follow my advice and seen no change though. Like I said above though, what works for the goose, does not work for the gander. And I'm not stomping on Dylan's opinion above, merely stating my opinion that no one really knows...all we have is opinions.
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