check out the below.
http://www.techguys.ca/howto/index.html
Miata owners typically replace the transmission fluid with 2 quarts of MTL Redline Synthetic Gear Oil.
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.
automatic has a dipstick under the hood. manual should have a plug on the side of it.
The 2011 Mazda MX-5-Miata has a 5-speed manual.
The 2004 Mazda MX-5-Miata has a 5-speed manual.
The 2012 Mazda MX-5-Miata has a 5-speed manual.
The 2009 Mazda MX-5-Miata has a 5-speed manual.
The 2005 Mazda MX-5-Miata has a 5-speed manual.
The 2014 Mazda MX-5-Miata has a 5-speed manual.
The 2007 Mazda MX-5-Miata has a 5-speed manual.
The 2013 Mazda MX-5-Miata has a 5-speed manual.
The 2001 Mazda MX-5-Miata has a 5-speed manual.