I have discovered that I have an oil leak at my oil filter sandwich plate in my R33 GTR. It must have been happening for a while as there is dry greasy oil all over my front diff and is also spreading down my sump. I have put the car up on blocks, removed the bash plate to have a closer look but things are pretty tight given the sandwich plate sits just above the front diff and behind the engine mount and I cannot get a good view of where the leak is actually coming from. Working from the top, I removed the PCM valve and extended my arm under the sandwich plate and it was quite wet with oil, however, not sure if the leak is from the earls hose connections or the sandwich plate itself.
I assume these sandwich plates screw on like an oil filter and have a rubber o-ring to seal correctly?
Has anyone had this problem?