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Old 05-01-2009, 05:16 PM   #1
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Default 6-speed gear oil crew: testimonies, give them to me

I'm about to do the swap and run motul 300 75w90. I've had a tough time getting a hold of gl-4 analysis data.

Special note:
this is not a 5-speed discussion thread
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Old 05-01-2009, 05:25 PM   #2
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You're not going to break your 6spd for running standard 6spd oil in it. Just change it every season or whenever you feel like.

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Old 05-01-2009, 06:36 PM   #3
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actually I just looked at the datasheet, so i can't use the motul I bought. I'm leaning toward motorcraft synth 75w90 unless someone can suggest something better.

I know that a synth will provide the viscosity stability and anti-scuff we need, I want information on shift-feel because my sister's 6-speed shifter feel suck ***.
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Old 05-01-2009, 07:57 PM   #4
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Quote:
Originally Posted by hustler View Post
my sister's 6-speed shifter feel suck ***.
Has she been doing this to it?:

https://www.miataturbo.net/forum/t34592/
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Old 05-01-2009, 08:07 PM   #5
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Quote:
Originally Posted by hustler View Post
I'm leaning toward motorcraft synth 75w90 unless someone can suggest something better.
That's what I'm going to run. I've been reading for days and it appears to make the .net crowd happy so the shift feel must be good.

Quote:
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I want information on shift-feel because my sister's 6-speed shifter feel suck ***.
Have her make the switch and ask if it is as good as people say.
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Old 05-01-2009, 08:59 PM   #6
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Just run whatever is ******* in it. This isn't a 500whp krautrocket, it's a 280hp Mazda. Nobody breaks the ******* transmission.

Stupid vagina.
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Old 05-01-2009, 09:29 PM   #7
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Why not


PRODUCT DESCRIPTION
AMSOIL Synthetic Manual Transmission and Transaxle Gear Lube (MTG) is a premium blend of the finest synthetic base oils and advanced, high-performance additives. It is formulated specifically for maximum protection in the most demanding manual transmission and transaxle applications where an extreme pressure GL-4 gear lube is specified, including those where high horsepower/high torque engines and towing or heavy loads increase transmission stress.

AMSOIL MTG prevents the thinning effects of mechanical shear. It maintains its viscosity and superior film strength for consistent, long-lasting wear protection. MTG excels in hot and cold temperature extremes that exceed the limits of conventional mineral oils. It protects against rust, keeps seals soft for long life, and is compatible with brass synchros for smooth synchromesh shift quality.

Performance Features

Reduces friction, heat and wear
Superior high temperature stability
Resists heat, oxidation, acid build-up and varnish
Lasts two times longer than conventional petroleum oils
Improves cold weather shifting

Applications
Recommended for synchronized manual transmissions and transaxles that require 75W-85, 75W-90 or 80W-90 viscosities and any of the following performance specifications: API GL-4 and MT-1, ZF TE-ML 02B, 16A, 17A and 19A, Chrysler MS-9070, MAN 341 ML. Recommended for use in NV 4500 transmissions, and replaces GM part #12346190 and Chrysler part #4874459.

Meets GL-4 performance specifications required by some models of Acura, Hyundai, Infiniti, Kia, Land Rover, Lexus, Mazda, Mitsubishi, Nissan, Subaru, Suzuki, Toyota, Volkswagen, Hino Mitsubishi-Fuso, and Zetor. Ideal for muscle car transmissions such as Muncie, Borg Warner, Saginaw, Ford Toploader, Dearborn and New Process. Also recommended for Gear Vendors Gear Splitters.

https://www.amsoil.com/storefront/mtg.aspx

At cost from a forum member:
https://www.miataturbo.net/forum/t8774/

Chris
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Old 05-01-2009, 09:46 PM   #8
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I am running Motul Gear 300 in my 6-speed per the recommendation of Gary at Track Dog Racing. They have tried some other oils, including royal purple, and find this one works best, especially with synchro performance. So far it is working great. It shifts well and seems to be improving a bit as I drive it more.

A bunch of m-netters seem to love the $20/qt motorcraft stuff. There are several threads over there talking about how great it is.

So why are you thinking you can not run Motul 300 in yours Hustler? If you already have it, just put that **** in and STFU.

Last edited by ZX-Tex; 05-01-2009 at 09:57 PM.
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Old 05-01-2009, 09:54 PM   #9
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i've always used syncromesh. now i'm using royal purple and they call it ''syncromax'' it has worked great in all the cars i've had. all the dsm guys use it and the trans. shifts way better. same thing with the honda guys, especially all the s2k peeps. but they run standard motor oil in their tranny's. the dsm's call for 75w90 but nobody uses that. and i've used it on my miata for 2 years. although i would change it out more often than once a year if you do a lot of trackdays.
in the diff i've been using royal purple 75w90. they call it ''gearmax''. although this last time they were out of 75w90 and i used 85-140w. anybody know whats up with that? would that heavy an oil be bad?
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Old 05-01-2009, 10:04 PM   #10
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Default I run amsoil

I have tried several tranny oils, but always come back to amsoil.
Seems to work best street or race
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Old 05-01-2009, 10:11 PM   #11
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Quote:
Originally Posted by ZX-Tex View Post
So why are you thinking you can not run Motul 300 in yours Hustler? If you already have it, just put that **** in and STFU.
Gary is going to give me **** over this, but I'm not going to use a gl-5 in a gl-4 trans. the EP and FM in the GL-5 will build-up on the synchronizers, just like Mobile1 did on my original trans, and smoked the 3rd gear synchro. i had the same problem in my VW, but never got past the marketing **** to determine why GL-5 wasn't working in my "yellow metal synchro" trans.

Quote:
Originally Posted by spoolin2bars View Post
in the diff i've been using royal purple 75w90. they call it ''gearmax''. although this last time they were out of 75w90 and i used 85-140w. anybody know whats up with that? would that heavy an oil be bad?
as long as you can get the oil hot enough to drop the viscosity, then the 140 will work. Lots of SM guys do this, but you must do it with a dino-oil because from the oil analysis I read today, you'd have to take a synthetic gear oil over its flash point, above the melting point of seals to drop the viscosity low enough for it to work.


before everyone starts the hate, I wouldn't trip about this if I hadn't smoked a 3rd gear synchro due to running M1.

I may try that Amsoil if I can get it.
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Old 05-01-2009, 10:59 PM   #12
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i have redline 75w90, works fine but the shift feel isnt that great on my 6 speed. I have driven savs and his short shifter makes all the difference in the feel. I think we both have redline in our trannys too.
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Old 05-02-2009, 07:00 AM   #13
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Put it what you have, you'll crash that car before you wreck the synchro. And if you do blow it before that, youll be fast enough to never ever use 2nd gear on a track anyway - hopefully. I cant remember a track where I would use 2nd at race speed.

*) Oh maybe Circuit de Spa-Francorchamps at La Source of the Bus Stop chicane...
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Old 05-02-2009, 10:27 AM   #14
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Quote:
Originally Posted by Spookyfish View Post
I cant remember a track where I would use 2nd at race speed.
The Bus Stop at Hallet
The Rattlesnake at Motorsports Ranch
Both tracks in the Texas/OK area.
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Old 05-02-2009, 12:36 PM   #15
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lol @ people believing EP and FM won't cling to brass synchronizers.

Oil is oil, right?
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Old 05-02-2009, 05:27 PM   #16
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Old 05-02-2009, 06:25 PM   #17
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Ill have to agree with the Amsoil folks
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Old 05-03-2009, 06:29 PM   #18
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The Amsoil manual trans/transaxle fluid is the standard recommended fill for the 5 and 6 speed. The GL5 75w90 fluid will protect the transmission gears a little more (according to Amsoil tech) but the shifting isn't quite as buttery smooth. You can even run the Severe Gear fluid in there, but I've been told the shifting gets quite notchy. If you want to try the Synchromesh style fluid, the Amsoil version is cheaper than the Motorcraft stuff. Gary is an ace. If he said the Motul is good stuff, I'd believe him, but I bet the cost is pretty high (without me checking). Redline is good stuff. The research I've done indicates that RP is good for the short term, then falls off quickly. You're going to start splitting hairs here, just get a good quality synthetic and go.
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Old 05-04-2009, 09:37 AM   #19
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Quote:
Originally Posted by soflarick View Post
The Amsoil manual trans/transaxle fluid is the standard recommended fill for the 5 and 6 speed. The GL5 75w90 fluid will protect the transmission gears a little more (according to Amsoil tech) but the shifting isn't quite as buttery smooth. You can even run the Severe Gear fluid in there, but I've been told the shifting gets quite notchy. If you want to try the Synchromesh style fluid, the Amsoil version is cheaper than the Motorcraft stuff. Gary is an ace. If he said the Motul is good stuff, I'd believe him, but I bet the cost is pretty high (without me checking). Redline is good stuff. The research I've done indicates that RP is good for the short term, then falls off quickly. You're going to start splitting hairs here, just get a good quality synthetic and go.
Why are you recommending the shock-proof GL-5 for a brass synchro trans?
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Old 05-04-2009, 12:52 PM   #20
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I'm not recommending it, I'm saying that people have used it in their 5 and 6 speeds. The Amsoil tech informed me it can be used in our transmissions, but it will not shift as smoothly as the manual trans/transaxle lube or the regular synthetic gl5 75w90 lube. He said some people use it to provide more protection for the gears under high hp/high rpm circumstances, such as open track racing. I personally have not used it in either of my 5 or 6 speeds. I've used the manual trans/transaxle fluid and the gl5 lube.
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