For the 5 spd. transmission:
Park the car on a flat surface, jack it up, placing it on jack stands to get space for your body
On the transmission's driver side, there's a square bolt on the middle, it's the filler bolt, after removed, put your finger in and if you feel the fluid is ok; otherwise it needs some, refill until it starts coming out, put the bolt back and clean the area.
check out the below. http://www.techguys.ca/howto/index.html
automatic has a dipstick under the hood. manual should have a plug on the side of it.
Miata owners typically replace the transmission fluid with 2 quarts of MTL Redline Synthetic Gear Oil.
How to check the transmission fluid in a 1995 Mazda 626
Fill the transmission filter with transmission fluid before you put the new transmission filter on. You probably will not need to add any transmission fluid.
You add fluid the same place you check the fluid level.
You do it from under the car. Through the filler plug. Jacking the car on a level surface, remove the filler bolt (square bolt in the middle of transmission on driver's side) and put your finger into the hole, if you feel the fluid it's OK; otherwise, refil
go on bing.com
Mazda recommends 75w-90 weight oil for the manual transmission, changed at 30,000 mile intervals. See http://www.miata.net/garage/maint.html for more information
1 Quart
A 2001 Mazda Protege has a seal system, meaning the car does not have a dipstick to check the transmission fluid. It is best to take it to a dealership to have the fluid tested, but a person can check it by slightly pulling out the plug under the car, and see the condition of the fluid coming out of the plug.
Take it to a auto shop and ask them to check the transmission fluid level and watch them then say thanks and buy some fluid.