The oil light momentarily blinked on my 02 wagon so I took it in to the dealer and they think it's either a head gasket or a valve cover. Having had to replace a head gasket in another WRX, I know the horror of that job. However, the leak is slow and I have seen no oil on the ground and temperature problems. The leak is on the passenger side.
My question is whether it sounds like a head gasket?