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#4556909 - 10/28/17 08:13 AM GL5 MT1 in an Older Transmission
redwolf4k Offline


Registered: 10/06/08
Posts: 68
Loc: NY
Hello,

This may be one of the most clouded topics in regards to gear oil. In 2017, is a GL5 MT1 rated gear oil acceptable in a thirty year old brass synchro manual transmission?

GL5 gear oil is cheap nearly everywhere, GL4 gear oil is mainly from specialty brands and expensive.

I wanted to ask the pros here: GL5 MT1 = yellow metal safe?


Edited by redwolf4k (10/28/17 08:14 AM)

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#4556918 - 10/28/17 08:26 AM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
_________________________
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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#4556972 - 10/28/17 09:36 AM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
zeng Offline


Registered: 09/01/15
Posts: 2183
Loc: Malaysia
Originally Posted By: redwolf4k
I wanted to ask the pros here: GL5 MT1 = yellow metal safe?


Yes, a GL5 without MT1 = yellow metal safe. Period.
A GL5 with MT1 = more safe, if one must differentiates.

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#4556991 - 10/28/17 09:52 AM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
You are wrong.... GL5 solo is never yellow metal safe!

GL4+.... GL4/5...or GL5/MT-1 tends to be yellow metak safe...

Althouhg some yenks are saying that it is not so...in 21.st century
_________________________
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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#4557068 - 10/28/17 10:52 AM Re: GL5 MT1 in an Older Transmission [Re: Kamele0N]
zeng Offline


Registered: 09/01/15
Posts: 2183
Loc: Malaysia
Originally Posted By: Kamele0N
You are wrong.... GL5 solo is never yellow metal safe!

What a bold and hilarious claim!
Ever read about deactivated/buffered sulfur additives in modern day,that is , current GL5 gear oil formulations ??

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#4557330 - 10/28/17 02:39 PM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
redwolf4k Offline


Registered: 10/06/08
Posts: 68
Loc: NY
Thank you for the link, did not realize this is currently being discussed.

Seems to be two camps here, which is why I came here in the first place. If only GL4 gear oil was cheap like GL5, and not becoming exclusive to specialty brands that want $20 a quart. I do not want to support such a price point for GEAR LUBE.


Edited by redwolf4k (10/28/17 02:40 PM)

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#4557406 - 10/28/17 03:52 PM Re: GL5 MT1 in an Older Transmission [Re: zeng]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
Originally Posted By: zeng

Ever read about deactivated/buffered sulfur additives in modern day,that is , current GL5 gear oil formulations ??


Yes but that "buffered sulphur" is in yellow metal safe formulations...

And labeled as... GL4+... GL4/5...or GL5/MT-1

And NEVER under GL5....solo/alone
_________________________
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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#4557433 - 10/28/17 04:25 PM Re: GL5 MT1 in an Older Transmission [Re: Kamele0N]
kschachn Offline


Registered: 12/26/05
Posts: 9369
Loc: Upper Midwest
Doesn't the GL-5 specification in and of itself have yellow metal protectants? My ECHO owner's manual says either is acceptable and it has brass synchronizers. I've used Mobil 1 gear oil for a long time and according to the container it is GL-5 only.
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#4557475 - 10/28/17 05:18 PM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
_________________________
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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#4557535 - 10/28/17 06:25 PM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Originally Posted By: redwolf4k
Hello,

This may be one of the most clouded topics in regards to gear oil. In 2017, is a GL5 MT1 rated gear oil acceptable in a thirty year old brass synchro manual transmission?

GL5 gear oil is cheap nearly everywhere, GL4 gear oil is mainly from specialty brands and expensive.

I wanted to ask the pros here: GL5 MT1 = yellow metal safe?


You're missing a key point here as explained in the linked posts.

Sure GL-5 differential lubes are relatively cheap but they don't have the proper Anti-wear additive mix, nor do they have the friction modifiers that make for smooth synchro operation.

And GL-5 differential lubes have a higher viscosity than specially formulated (dedicated) MTF's, which may make shifting more of a chore in cold temps.

If your transmission requires a 75W90, then Amsoil MTG or Redline MT-90 would work a heckuvalot better in your tranny.


Edited by MolaKule (10/28/17 06:26 PM)

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#4558091 - 10/29/17 08:02 AM Re: GL5 MT1 in an Older Transmission [Re: Kamele0N]
kschachn Offline


Registered: 12/26/05
Posts: 9369
Loc: Upper Midwest
_________________________
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 394K
2000 Toyota ECHO, 267K

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#4558092 - 10/29/17 08:03 AM Re: GL5 MT1 in an Older Transmission [Re: Kamele0N]
zeng Offline


Registered: 09/01/15
Posts: 2183
Loc: Malaysia
Originally Posted By: Kamele0N
Originally Posted By: zeng

Ever read about deactivated/buffered sulfur additives in modern day,that is , current GL5 gear oil formulations ??


Yes but that "buffered sulphur" is in yellow metal safe formulations...

And labeled as... GL4+... GL4/5...or GL5/MT-1

And NEVER under GL5....solo/alone


Still insists GL5 corrodes yellow metal synchronizers ?
Listen to Paul's video in post #1 here from 11.25 -15.20

Edit:spelling


Edited by zeng (10/29/17 08:09 AM)

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#4558323 - 10/29/17 11:54 AM Re: GL5 MT1 in an Older Transmission [Re: redwolf4k]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
OK...it seems that you are correct...
_________________________
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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#4558984 - 10/30/17 06:59 AM Re: GL5 MT1 in an Older Transmission [Re: MolaKule]
redwolf4k Offline


Registered: 10/06/08
Posts: 68
Loc: NY
Originally Posted By: MolaKule
Originally Posted By: redwolf4k
Hello,

This may be one of the most clouded topics in regards to gear oil. In 2017, is a GL5 MT1 rated gear oil acceptable in a thirty year old brass synchro manual transmission?

GL5 gear oil is cheap nearly everywhere, GL4 gear oil is mainly from specialty brands and expensive.

I wanted to ask the pros here: GL5 MT1 = yellow metal safe?


You're missing a key point here as explained in the linked posts.

Sure GL-5 differential lubes are relatively cheap but they don't have the proper Anti-wear additive mix, nor do they have the friction modifiers that make for smooth synchro operation.

And GL-5 differential lubes have a higher viscosity than specially formulated (dedicated) MTF's, which may make shifting more of a chore in cold temps.

If your transmission requires a 75W90, then Amsoil MTG or Redline MT-90 would work a heckuvalot better in your tranny.


This is a good point.

What I gather from everything here is both GL4 and GL5 is safe for use, but GL4 is the fluid I should use in regards to its functionality with a manual gear box. I will do as follows: Put cheap GL5 gear oil in my Diffs and transfer case, but I will order up some Redline MT90 for the tranny, as it is something I have to feel all day long while driving. I really hate spending upwards of $20 a quart for either of these. But I guess it is only once in a while.

Thank you for all the clarification!


Edited by redwolf4k (10/30/17 07:04 AM)

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