the car belongs to my wife's sister. it is a 1992 toyota tercel....i believe it is called gear oil. it leaks inside the car between the gas pedal and the brake pedal is at. It only leaks if you drive the car around for a while but doesn't if you just leave the car on. it smells like motor oil. the little thing that goes into the transmission that is located behind the engine on top of the transmission as in the picture. not sure what it is called but i just heard my dad's boss (works at a transmission shop) call it a bullet. i have replaced the o ring that goes around it and the o ring that is inside and it is still leaking. i am just a beginner at this so i do apologize for anything i have said that is wrong, but Could anyone give me an idea of what the problem is?