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Where is the manual transmission fill hole on my 2005 Mazda 3?

Manual transmission liquid must be changed every 62000 miles as indicated by owner's manual for 2004 Mazda 3. The fill plug is someplace on the side of the transmission typically it is at about 1/3 height of the tranny since it works as the liquid level display also. It may be at the differential housing, or in the front, but be carefull not to open wrong screw. I'd tell to do this operation at the dealer it is not costly and they use correct liquid.

IF and big IF you have one then it'll be either on the transmission near the rear major seal of the motor or over the tranny between the motor and the driver side strut mount. don't rack your brain although most manual transmissions don't have a fill. From what I have seen only Hondas seem to have a fill for manual transmissions.

There is not one. You only add brake liquid to the slave cylinder which is behind and to the right of the brake master cylinder.

There isn't one. it's just a screw you remove to fill it.
Manual transmissions don't have to be changed or refilled as there's no place for it to leak out.

Honestly, I do not think you have one. I drove a manual Ford Mazda engine and there was not one.