Updated List of MTF's (both GL-4 and GL-5)

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mattwithcats said:
Ultra1 Plus 75w-90 GL-4

"With Limited Slip Differential additive package."
Click to expand...

Absolutely Wrong friction modifier for MTF's.
mattwithcats said:
Mobil 1 Delvac ATF, TES-295/Synthetic Dexron III
https://www.mobil.com/en/lubricants/for-businesses/heavy-duty-lubricants/products/mobil-delvac-1-atf
Click to expand...

We're discussing MT's, not automatic transmissions.
mattwithcats said:
Mobil 1 Delvac 75W-90, GL-5
https://www.mobil.com/en/lubricants...cants/products/mobil-delvac-1-gear-oil-75w-90
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"Heavy duty non-synchronized manual transmissions, axles and final drives requiring API GL-5 and MT-1 performance

Other heavy-duty industrial gear drives including hypoid and worm gears operating under conditions where high speed/shock load, high speed/low torque, and/or low speed/high torque conditions prevail."

Their talking about Heavy Duty non-synchronized truck transmissions as we have discussed previously.

Apparently you still have not understood the requirements for MTF's in Light truck and passenger vehicle MT's..

Shotgunning gear lubes seems to be your forte.
 
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mattwithcats said:
The VOA of the Ultra1 Plus looks no worse than the VOA of Delvac 50
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And from that you can deduce the tribological properties and appropriate applications for these fluids?
 

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Are there any issues with some of the MTF’s “dissolving” carbon fiber blocking rings? Thanks!
 
rusty3012 said:
Are there any issues with some of the MTF’s “dissolving” carbon fiber blocking rings? Thanks!
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Not that I or the industry are aware of.

The carbon fiber blocking rings are composites constructed of a number of materials such as Kevlar fibers and carbon with carbon as the majority component and fused together by a very tough "binder."
 
MolaKule said:
Not that I or the industry are aware of.

The carbon fiber blocking rings are composites constructed of a number of materials such as Kevlar fibers and carbon with carbon as the majority component and fused together by a very tough "binder."
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Great to know. Thank You.
 
Huge Thanks MolaKule!!

Fantastic resource.

On the side of the transmission in my H3, casted into the aluminum it reads "GL-3 75W-90" - A fluid that was basically already phased out when these vehicles rolled off the assembly line. The manual calls for GM part number 89021806

A GL-4 75W-90 like the ACDelco 10-4059 is the modern replacement.

Unfortunately, Valvoline stamps the old GM part number on their bottle of 75 weight MTF and I fell for it....

1699178859939.png


Sorry it's hard to make out in the photo stolen from their website, but it's the 5th part number in the sequence of GM part numbers there. Basically, a lie!!!!!!

I use Redline MT-90 for this application now but the Valvoline spent some time in that transmission before I was informed that it was the wrong stuff.

For SHAME Valvoline, for SHAME. MolaKule was the one to inform me that this was the wrong fluid several years ago, I even sent an email to Valvoline about this and their bottle still claims to be compatible. Not sure how that works... I feel like this would qualify as some form of fraud, selling a 75 weight fluid as a replacement for a 90 weight fluid.
 
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Is there a list of GL-5 of differential GL-5 oils that are non corrosive to yellow metal. I.e.brasd, bronze and copper,

Most GL-5 oils use sulfur based modifiers.
.
The only one I have found claiming to be non corrosive is Royal Purple IS MAXGEAR 75W/90 GL-5.

They claim to be non corrosive to yellow metal on their bottle and web site.
This is only of interest to those with differentials that have yellow metal. I.e.brass, zinc, copper. For example MG TD.

I thought a list would be of interest.

AptosJames
 
mdocod said:
I use Redline MT-90 for this application now but the Valvoline spent some time in that transmission before I was informed that it was the wrong stuff.

For SHAME Valvoline, for SHAME. MolaKule was the one to inform me that this was the wrong fluid several years ago, I even sent an email to Valvoline about this and their bottle still claims to be compatible. Not sure how that works... I feel like this would qualify as some form of fraud, selling a 75 weight fluid as a replacement for a 90 weight fluid.
Click to expand...
This is a synchromesh fluid with a 8.8 cSt@100C viscosity according to Valvoline's data sheet but it is not a 75W90, since a 75W90 MTF usually has a viscosity of 14.5 cSt@100C.
 
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@MolaKule I just replaced my BMW MTF-LT-5 (ZF says equivalent to FFL3) with Motul High Torque DCTF. I did contact Motul and they said it was suitable for this application but they chose not to list the MT spec because they were coming out with a less expensive fluid for MT applications. Anyway, it seems like it shifts easier when warm than the OE fluid but the shifting when cold is a bit worse than it was. This is a bit perplexing to me since it appears to be slightly thinner. Any thoughts?

https://azupim01.motul.com/media/motulData/DO/base/HIGH_TORQUE_DCTF_en_FR_motul_45615_20210713.pdf
 
chris719 said:
@MolaKule I just replaced my BMW MTF-LT-5 (ZF says equivalent to FFL3) with Motul High Torque DCTF. I did contact Motul and they said it was suitable for this application but they chose not to list the MT spec because they were coming out with a less expensive fluid for MT applications. Anyway, it seems like it shifts easier when warm than the OE fluid but the shifting when cold is a bit worse than it was. This is a bit perplexing to me since it appears to be slightly thinner. Any thoughts?
Click to expand...
This fluid linked is an LV MTF.

Lower viscosity fluids do not guarantee smother shifting. Transmission wear and FM type can affect shifting as well.
 
MolaKule said:
This fluid linked is an LV MTF.

Lower viscosity fluids do not guarantee smother shifting. Transmission wear and FM type can affect shifting as well.
Click to expand...
I see. I assume the primary difference between MTF and DCTF is the friction modifiers for the wet clutch packs?

The transmission shouldn't have a lot of wear with only 9k miles, but yeah I just assumed the cold shifting would be improved with the slight viscosity reduction. Guess not.
 
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