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Old 07-18-2020, 10:50 AM   #1
Jrae2424
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Member#: 422118
Join Date: May 2015
Default Gear oil for 5eat transmission?

I was looking to have the transmission fluid changed and when going the the records from the previous owner of my car and found that at 92000 miles the transmission fluid was changed to Motul 75-90 gear and transmission oil. Since I've had the car I have noticed that the shifting can be really slow, especially in the morning to the point where I have to feather the gas to get it to shift. Even when the car is warmed the shifting can be really slow.

I see that the Motul Viscosity is 72.2mm^2/S at 40C and 15.2 mm^2 at 100C 100C. (1cSt = 1mm^2/S)
Amsoil Transmission Fluid is 38.5cSt @ 40C and 38.5cSt @100C

The Motul is pretty much double the viscosity. The gear/transmission 75-90 looks to be ok if used in a manual transmission, but I've read it is not recommened in an automatic. Could this be affecting the shifting?

And should I switch back to the recommened ATF?
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Old 07-18-2020, 11:09 AM   #2
Jrae2424
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Default

Never mind, EFI logics solved this one, the work order wasn't from there shop, but it does say replace transmission fluid with Motul 75-90, but it was only 1 qt. EFI said it most likely went to the differential.
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Old 07-18-2020, 11:11 AM   #3
Samurai Jack
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Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
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2002 Enemy of Aku

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What kind of transmission are you talking about?

You start by talking about a 5MT then you start talking about an automatic.
You don't put ATF in a manual transmission or differential and you don't put gear oil in an automatic transmission
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Old 12-02-2020, 05:45 PM   #4
Scargod
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Join Date: Oct 2010
Chapter/Region: NESIC
Location: S central CT, New England
Vehicle:
2007 STI
silver gray metallic

Default

Should delete this thread. Such garbage cluttering the forum.
Here I am looking for transmission oil info...
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Old 12-03-2020, 11:49 AM   #5
Samurai Jack
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2002 Enemy of Aku

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Quote:
Originally Posted by Scargod View Post
Should delete this thread. Such garbage cluttering the forum.
Here I am looking for transmission oil info...
What transmission oil info are you looking for?
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Old 01-05-2021, 05:01 PM   #6
604bugeye
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2002 WRX
WRB

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I use dexron VI for my ATF but thatís for my 4eat
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