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Old 05-31-2021, 01:09 AM   #1
Jason Bourne
 
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Default Changing Manual Transmission oil

I want to change my manual transmission oil. I have a 1993 2WD D21 2.4L 5 speed manual transmission. I have a few questions.

1. According to the service manual I have a FS5W71C transmission. The manual states that it should take 4 1/4 pints. Is this correct? I have read several places that the transmission needs to be overfilled. Not sure if this applies to my transmission. Not sure if this only applies to 4WD models. Or should it just be filled until it slowly drains out of the fill plug?

2. I am planning on using AMSOIL 75W-90 SAE GL-4 gear oil. Is this OK or is there something else I should be using?

3. I have looked at the fill plug and it is a square nut that looks rounded off. I think this might be impossible to get off. Assuming I can get it out is it possible to change to a half inch drive square hole like the diff uses? If so does anyone know a part number for one? Will the fill plug that is used in the diff fit the transmission or is it a different size thread? Has anyone ever changed the fill plug to the diff style plug?

4. If I can't get the refill plug out is it possible to fill it from the top under the shifter? Is that a hard process to do? Has anyone done this? Is there a thread out there that shows the steps needed to remove the shifter to fill the transmission oil?

Thanks for any help.
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Old 05-31-2021, 01:18 AM   #2
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I also had a 93 5 speed and used Amsoil GL4 with no issues, used it in my former 90 Sentra also.


Easiest way to refill is to pull the shifter and fill it from the top. It's only 4 bolts if I remember correctly, takes longer to remove the shifter boot.


Capacity is right if it is the FS5W71C trans - 4 1/4 Pints. When I changed my fluid according to my records I used 2.5 Quarts (5 pints)
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Old 05-31-2021, 01:30 AM   #3
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Thanks for the reply Ahardb0dy. When you filled it from the shifter is it obvious where you pour the oil into the transmission?

Should I also fill it to 5 pints?

Why 5 pints? Did you measure 5 pints when you drained it?
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Old 05-31-2021, 01:59 AM   #4
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filling through the shifter it can only go where it's supposed too.


I don't recall why I used 2.5 Quarts, it's just what I wrote in my records. It was back in 2014, lol


Supposedly the fill hole is too low on the tranny and that is why they say to overfill slightly, there is some argument about this as some people say with all the 5 speeds Nissan made if there was a problem with the fill hole they would have changed it.


I never experienced any issues with it being overfilled.
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Old 05-31-2021, 03:11 AM   #5
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And some of us put our trucks on a steep slope, leaning to the right, just to top off the trans some more through the fill-plug. I wonder what my neighbors thought I was doing ...
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Old 05-31-2021, 03:15 AM   #6
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Tranny fill hole side up on a kurb.
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Old 05-31-2021, 03:43 AM   #7
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Does it do any damage to the transmission if there is too much oil?
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Old 05-31-2021, 04:00 AM   #8
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I overfilled mine by a lot. I recently learned my overfill vent tube works when I discovered a "wet" area in my passenger fender area coming from near the clutch damper.
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Old 05-31-2021, 03:39 PM   #9
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Ahardb0dy

When you poured the oil in from the shifter did you remove the snap ring and pull the shift lever out to pour it down?

Or did you remove the control housing by removing the 6 screws?

See Pic with Red arrows

Again thanks for your help
Attached Images
File Type: jpg Shifter3.jpg (85.4 KB, 7 views)
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Old 05-31-2021, 03:40 PM   #10
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Quote:
Originally Posted by rockcrawls View Post
I overfilled mine by a lot. I recently learned my overfill vent tube works when I discovered a "wet" area in my passenger fender area coming from near the clutch damper.
How many pints do you think it had in it to cause your overfill?
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