gear oil

hi all, i am trying to change the gear oil in my MT the car is a 2002 protege es (2.0 L engine); manual transmission. The only things I found at Napa and Adv Auto Parts is Valvoline 75W90 (GL-5) and Coastal 75W90 (GL-5, GL-4, GL-3); I got the Coastal... but have doubts if I should use it. I...