On my mothers VN commodore, she got the pressure sender replace.. and then around 4 weeks later it started leaking again. Wat could be causing this ? Oil pressure build up ? My dad rekcons the bolt is on tight ( i don't take anything he says as 100% ) and he won't let me near the car to have a look at it. So if the bolt is tight.. is it the lil seal/gasket underneath the sender unit busting ? if so wat could be casuing it and any remedies ?