Yes, you can add a transmission cooler but the way they're making vehicles these days and there's not much room in the engine compartment to mount one. Sometimes you have to remove headlight assemblies, or bumper covers but it can be done.
There is no reservoir. All the transmission lube in stored inside the transmission.
The 2015 Mazda CX-5 has a 6-speed manual.
The 2013 Mazda CX-5 has a 6-speed manual.
The 2014 Mazda CX-5 has a 6-speed manual.
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.