shababr

i've a 98 EXi civic(D15Z4). recently i found out that my car would not go reverse when ever i shift the gear to R. it only goes to reverse after i press the accelrator harder for sometimes. but this symptoms occurs like once or twice a day. the other gear shifts work fine. d4,d3 are all working well. but whenever i shift to R the car doesn't move as if its in neutral state.it only moves after i press the accelator harder. i checked the gear oil and found out it was minimum. then i poured about 2ltrs of oil. but the problem is still there. i really dont want to open the gear box as it is very expensive and back in bangladesh where i live its very difficult to find civic parts. the mechanics are also not that well trained regarding civic. so u guys are the my only hope. plz reply ASAP. i will be grateful to you. thnax