My 1996 Maxima GXE has 77K on it. I am not sure if the ATF has ever been changed. I checked the fluid and it isn't completely burnt yet, it still has some red to it and doesn't really smell terrible. What type of ATF should I use? Nissan fluid only? I have heard some debates on whether to use cheaper ATF. How often, or how many miles, should I change the ATF? Should I drain the fluid once a week for about 4 weeks like posted in other threads?