My wife has a 2004 Chevy Cavalier with an EcoTec 4 cylinder and a 5 speed manual trans. I have checked the owners manual and there is no recommendation for when to change fluid in the 5 speed. It takes Dex III ATF in the manual trans. Looked in a service book at AutoZone and there were no pics or drawings indicating drain and fill locations. Any thoughts on when I should change fluid, what should I use, and where are the drain an fill locations ??? Thanks if you can help.