thanks for the info guys. i asked on another website and got an answer so i'd share it with you guys to see if it'll help someone else out. oh, i just changed oil but the problem existed before oil change. i thought that was it too but it wasn't.
according to the person from the other website, i have a rear engine seal leak on the engine side not the transmission, it's a small leak (seep), so he/she recommended for me to use, auto rx or lubro motor oil saver.
i'm going to try it tomorrow and report back if it works.