oil leak
 

i found my oil leak finally - its coming from a small metal plate on the back of the engine- RIGHT BELOW the turbo - its held on by 4 bolts, and under the plate is what appears to be a small rod witH a hole and spring system in it - i took the plate off and wiggled the piece out - it was coated with varnish and stuck - i assume it has someting to do with oil pressure - any chance anyone knows what it is ?? and what it does - and its name - i cant seem to find any images of it any where-it needs a new gasket
THANKS:)