Sabre-- highly reflective textures?

Hello, i'd like to make some highly reflective textures for the Olsson F-86, and i have no idea how to change the specular properties of the texture. any suggestions?
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=15&t=36010