6-speed gear oil crew: testimonies, give them to me
#1
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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
Special note:
this is not a 5-speed discussion thread
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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 ***.
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 ***.
#7
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Why not
![](https://www.amsoil.com/StoreFront/images/mtg_qt_350pxh.jpg)
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
![](https://www.amsoil.com/StoreFront/images/mtg_qt_350pxh.jpg)
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
#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.
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 08:57 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?
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?
#11
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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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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.
#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...
*) Oh maybe Circuit de Spa-Francorchamps at La Source of the Bus Stop chicane...
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#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.
#19
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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.
#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.