Motul gear 300 75w90 good?

[lyates1987]

Going to be flushing the tranny and diff soon. Read some good reviews on this stuff but just want to make sure this is legit to use on both the tranny and diff

[texasboy21]

Its best to use a GL4 specific fluid in the tranny/front diff, and a specific GL5 in the rear diff.

The additives that make the fluid GL4 and GL5 compliment can damage our brass syncros.

[Lysergik]

Amsoil sells the specific types of fluid needed for each component of the drivetrain. Motul is universal fluid, do people use it, yes, have their cars exploded, no. For the same amount of money you can get arguably better fluid that meets the exact Audi specifications.

[lyates1987]

Its best to use a GL4 specific fluid in the tranny/front diff, and a specific GL5 in the rear diff.

The additives that make the fluid GL4 and GL5 compliment can damage our brass syncros.

Thanks! That's exactly why I what I needed to know. I noticed the API being GL4/GL5 for this stuff. Had me wonderin

[lyates1987]

Amsoil sells the specific types of fluid needed for each component of the drivetrain. Motul is universal fluid, do people use it, yes, have their cars exploded, no. For the same amount of money you can get arguably better fluid that meets the exact Audi specifications.

Awesome. Thanks for the info guys!

[Charles.waite]

Gear 300 is both GL4 and GL5 certified though. I run it in my tranny and its good. A bit stiff when the weather is cold, but once the tranny warms up is shifts like butter, even at high rpms.

Not sure why people are hating on it. Its a really good fluid.... For $7/qt its a great option.

[imnuts]

Only problem I have with Motul in my car is the same as Charles said, it's not as smooth until things warm up a little bit.

[Spike00513]

Gear 300 is both GL4 and GL5 certified though. I run it in my tranny and its good. A bit stiff when the weather is cold, but once the tranny warms up is shifts like butter, even at high rpms.

Not sure why people are hating on it. Its a really good fluid.... For $7/qt its a great option.

I run it in everything. My car has not exploded.

Its best to use a GL4 specific fluid in the tranny/front diff, and a specific GL5 in the rear diff.

The additives that make the fluid GL4 and GL5 compliment can damage our brass syncros.

How?

[Lysergik]

I have never used Motul, so I cant comment on performance, feel, etc. I do know from reading posts on here and other forums that front differentials, and manual transmissions require the use of GL4 specified fluid, only. If I recall this is due to the brass components inside these parts. The GL5 additive, used for rear differential applications with gears made of different harder metals, can be harmful to the softer brass in the trans/front diff. Since Motul is universal it uses both GL4 and GL5 with additives in its formula, where as Amsoil uses only GL4 oil. So for me I would rather not risk slow, premature wear, on such expensive parts, especially considering my current mileage. The question is why use universal when you can use specific?

[Charles.waite]

GL specs are not additive packages. They're standards that the fluid must conform to.

Alll fluids you find on a store shelf are "universal". The only "specific" fluid there is is Audi brand fluid. But so long as they conform to a certain specification (GL-4 for the tranny and GL-5 for the rear diff) they are safe to run. Its totally reasonable that one fluid can meet BOTH specs. And Motul Gear 300 meets both specs.

[imnuts]

GL specs are not additive packages. They're standards that the fluid must conform to.

From what I can find, there is a difference in the additives between GL-4 and GL-5, with the change making GL-5 more corrosive to softer metals, like brass. I'm guessing that GL-4/GL-5 combo fluids have the increased additives of GL-5 with the lower corrosive properties of GL-4.

[Matt Devo]

Going to be flushing the tranny and diff soon. Read some good reviews on this stuff but just want to make sure this is legit to use on both the tranny and diff

I prefer Redline MTL (75w80) over the 75w90 for the trans/center diff, and use Redline MT-90 in the rear diff. Next time though I'm going to try some of the Fuchs Titan SintoFluid 75W80 that AdvancedAutomotion sells.

OT - where in Austin are you? been to any of the local meets yet?

[00passat]

As others said motul doesn't shift well when cold, I use oem fluid in my tranny's and shifts very well when cold.

[Lysergik]

GL specs are not additive packages. They're standards that the fluid must conform to.

Alll fluids you find on a store shelf are "universal". The only "specific" fluid there is is Audi brand fluid. But so long as they conform to a certain specification (GL-4 for the tranny and GL-5 for the rear diff) they are safe to run. Its totally reasonable that one fluid can meet BOTH specs. And Motul Gear 300 meets both specs.

So following that definition of universal would you then put GL5 in your front diff and GL4 in your rear diff?

My point was why put a fluid that meets both GL4 and GL5 specs into a component that specifically calls for GL4 only, when you can simply put straight GL4 spec fluid in it?

[imnuts]

My point was why put a fluid that meets both GL4 and GL5 specs into a component that specifically calls for GL4 only, when you can simply put straight GL4 spec fluid in it?

So you only have to buy one type of fluid for everything, rather than two, potentially cutting down on the total bottles of fluid needed.

[Lysergik]

So you only have to buy one type of fluid for everything, rather than two, potentially cutting down on the total bottles of fluid needed.

So having two bottles with left over fluid, versus one bottle of left over fluid is the reason for concern?

[seanf86]

I prefer Redline MTL (75w80) over the 75w90 for the trans/center diff, and use Redline MT-90 in the rear diff. Next time though I'm going to try some of the Fuchs Titan SintoFluid 75W80 that AdvancedAutomotion sells.

OT - where in Austin are you? been to any of the local meets yet?

any reason for the mt90 in the rear diff? its a GL4 fluid and rear diff needs GL5.

I run 2qts MT90 1qt MTL in my 5 speed and Redline GL5 75w90 in the rear diff, locally it was cheaper than the motul.

[Matt Devo]

any reason for the mt90 in the rear diff? its a GL4 fluid and rear diff needs GL5.

I run 2qts MT90 1qt MTL in my 5 speed and Redline GL5 75w90 in the rear diff, locally it was cheaper than the motul.

must have gotten them backwards, it's been a while since I changed the rear diff fluid

[Charles.waite]

So following that definition of universal would you then put GL5 in your front diff and GL4 in your rear diff?

My point was why put a fluid that meets both GL4 and GL5 specs into a component that specifically calls for GL4 only, when you can simply put straight GL4 spec fluid in it?

Are you purposely not reading what I'm writing? I don't know how to better explain it....

[Lysergik]

Are you purposely not reading what I'm writing? I don't know how to better explain it....

I guess our definitions/understandings of universal are different.

[lyates1987]

I prefer Redline MTL (75w80) over the 75w90 for the trans/center diff, and use Redline MT-90 in the rear diff. Next time though I'm going to try some of the Fuchs Titan SintoFluid 75W80 that AdvancedAutomotion sells.

OT - where in Austin are you? been to any of the local meets yet?

I've been to a few AEG meets. I'm pretty familiar with alpacino if you know him. I use to work at Austin Veedub a little bit ago. I live near McNeil & 183 but I'm moving to spicewood for a little bit in a week or so.

[jacobsen]

Motul has both the upgraded gear 300 and a standard 75w90. I use gear 300 in both trans and diff and I don't have problems shifting in cold. Motul makes the specific motor oils for VW/Audi. I use motul 8100 for the motor (you can't get a better oil than that and it only cost me around 30 bucks or 5 liter jug at carquest)

[Lysergik]

This is mainly in reference to the Tiptronic, but since manual transmissions use the same oil in the front differential the info is the same.

http://www.zf.com/media/media/docume...4/5HP19FLA.pdf

[Spike00513]

This is mainly in reference to the Tiptronic, but since manual transmissions use the same oil in the front differential the info is the same.

http://www.zf.com/media/media/docume...4/5HP19FLA.pdf

FWIW, it mentions Burmah SAF AG4, which is $75/L.

[Lysergik]

FWIW, it mentions Burmah SAF AG4, which is $75/L.

Weren't you asking what OEM fluid actually is?

[Charles.waite]

I was thinking about trying that too....due to Scotty's recommendation.

Anybody know what the OEM fluid actually is? I don't want to pay $30 extra for an Audi sticker.
I assume it's the same deal as Pentosin coolant, brake fluid, and P/S fluid, which Audi just repackages and marks up pricing.



"Only"? I stocked up on 0w40 euro M1 5L jugs for $12/ea, and Castrol Edge 0w40 euro for like $22/ea.

Please humor me, how exactly is motul 8100 a good oil. What makes it good. Why do you pick it.

I don't care if you don't have problems shifting in cold. My priority isn't to have my trans able to shift in cold for a week. My priority is to have it last many years without needing synchro replacement, which is what the concerning matter is, which you did not address whatsoever in your post. In your 20+ word post, I was able to gather absolutely NOTHING, and the fact that gear 300 will not make the car spontaneously combust in cold weather has already been established by many people, including some in this thread, such as Charles and myself. Read again.

"Don't have problems shifting in cold"
Oh, so you're an expert? What exactly does that even mean?
To what metric do you compare? How do you tell? Since when did the world appoint you as the foremost expert on what a shift is and how it should feel?
What if it could be better? What if it could wear less? How long will it last? There is more to a transmission than whether it goes into a gear or not.
That's like saying a car is in good shape because it moves forward under its own power, even though gears are broken and it misfires

I wonder why Scotty recommends the Titan Fuchs fluid, and not Gear 300. Does he have a marketing deal with Fuchs?

Uhhh. I think you need to dial it back a few notches.

[Lysergik]

Never thought a thread on oil preference could solicit so many entertaining responses.. I'm pretty sure the OP has tuned out by now. Anyhow, if people wanna run Motul, then run Motul, its your car. For me, ill continue to use and promote Amsoil as my personal preference.

[jacobsen]

Motul gear 300 will not harm your yellow/soft metal synchro. Motul would not list it backwards compatible if it would. This concept used to be true years ago but not any more. Yep Motul Ester core and PAO oils are the best. I could write a novel why.

GEAR 300
75W-90
Racing gearbox and differential lubricant

100% Synthetic – Ester based

TYPE OF USE
Specially designed for racing vehicle gearboxes : speed way, rallye, raid…
All mechanical transmission, synchronised or not synchronised gearboxes, gearbox/differential, transfer
gearboxes and hypoïd differentials without limited slip system operating under shocks, heavy loads and
low revolution speed or moderate loads and high revolution speed.

PERFORMANCES
STANDARDS API GL4 and GL5 / MIL-L-2105D
100% synthetic extreme pressure lubricant for an efficient anti wear protection, a better resistance at
high temperature and a longer life time.
0% shear loss : Unshearable oil film in extreme conditions.
Stays in 90 grade after KRL 20 hours shear test as requested by SAE J306 Standard, July 1998 update
Very high lubricating power which decreases friction and wear.
90 grade at hot temperature to provide outstanding oil film resistance at hot temperature and/or to
reduce transmission noise.
Fluid at low temperature to allow easier gear shifting when the gearbox is cold.
Less effort required on the gear lever to shift the gears.
Suitable for any type of seal and yellow material used in gearboxes design.
Anti-corrosion, Anti-foam.

RECOMMENDATIONS
Oil change: According to manufacturers' requirements and adjust according to your own use.

PROPERTIES
Viscosity grade SAE J306 75W-90
Density at 15°C (59°F) ASTM D1298 0.900
Viscosity at 40°C (104°F) ASTM D445 72.6 mm²/s
Viscosity at 100°C (212°F) ASTM D445 15.2 mm²/s
Viscosity index VIE ASTM D2270 222
Flash point ASTM D92 200°C / 392°F
Pour point ASTM D97 -60°C / -76°F

[Charles.waite]

^^ that's what I'm saying. Thanks for posting the actual specs. Again the GL specs are SPECIFICATIONS that the oil must meet. They aren't necessarily mutually exclusive and they aren't a fixed "additive package".