2004 Honda Civic 5 speed base model. Car is college car for my son. Oil is leaking behind harmonic balancer so I replaced front seal and oil pan gasket. It still leaks at approximate same place but can't be seen with balancer and timing cover in place. And is has to be running to leak as it does not leak statically. The way it let go suddenly it seems to have to be gasket or seal. Does anyone know if there is common failure leak in that general area to focus on. TIA.