Which Amsoil MTF to use?
09-14-2011, 09:03 PM
#1
Thread Starter
Which Amsoil MTF to use?
As the topic states, wondering whether I should use the Synchromesh, here: http://www.amsoil.com/storefront/mtf.aspx
or this one: http://www.amsoil.com/storefront/mtg.aspx
Aren't they both compatible?
Thanks
or this one: http://www.amsoil.com/storefront/mtg.aspx
Aren't they both compatible?
Thanks
09-14-2011, 10:11 PM
#3
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Amsoil MTF 
It is strange (confusing) Amsoil used an engine oil viscosity spec (5W-30) for gear oil though.
Also, 5W-30 is not 1/3 of 75W-90.
The 5W-30 is about 25-30% thinner, that's all.
It is strange (confusing) Amsoil used an engine oil viscosity spec (5W-30) for gear oil though.
Also, 5W-30 is not 1/3 of 75W-90.
The 5W-30 is about 25-30% thinner, that's all.
09-15-2011, 07:21 AM
#4
Thread Starter
Thanks for the responses. I'm almost positive the 75W-90 is what I have in my car right now and am gearing up to buy more for a CR that I'm buying 
Do people use the 75-90 for race applications or cars in hot climates?
Do people use the 75-90 for race applications or cars in hot climates?
09-15-2011, 09:22 AM
#5
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One small correction:
- Amsoil MTF (5w-30) is 9.6 cSt @ 100C
- Amsoil MTG (75W-90) is 14.8 cSt @ 100C
That makes MTF 35% thinner than MTG - MTG as reference.
Looking at both specs a bit closer I think MTF is the better fluid though.
The 4-ball wear test (yes it does make sense in gear oils - not for engine oils) gives a better result with MTF.
MTF - 0,40mm scar
MTG - 0,45mm scar
And the copper corrosion test is also better with MTF, it gets the lowest rating, 1A
MTG gets 1B.
I would go for the synchromesh formulated oil, even in a CR.
P.S. maybe you should pay more attention to diff oil
- Amsoil MTF (5w-30) is 9.6 cSt @ 100C
- Amsoil MTG (75W-90) is 14.8 cSt @ 100C
That makes MTF 35% thinner than MTG - MTG as reference.
Looking at both specs a bit closer I think MTF is the better fluid though.
The 4-ball wear test (yes it does make sense in gear oils - not for engine oils) gives a better result with MTF.
MTF - 0,40mm scar
MTG - 0,45mm scar
And the copper corrosion test is also better with MTF, it gets the lowest rating, 1A
MTG gets 1B.
I would go for the synchromesh formulated oil, even in a CR.
P.S. maybe you should pay more attention to diff oil
09-15-2011, 06:04 PM
#7
What is the longest lasting trans fluid for a '06 ? Can you mix two, like 1qt. of MTG and 1qt. of MTF from Amsoil and get longer life. I put a lot of miles on my car(34k miles a year) in 100 deg. heat in the summer and down to the mid 30's in the winter and I don't like to have to change the fluid in the transmission every 8k miles.
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09-16-2011, 05:20 AM
#10
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Take a look at the existing tranny fluid threads.