weird oil leaking rear main seal or oil pan arch - maybe PCV valve

lilredridinghoo said

@medroy340, that a good idea... will have a look at it, especially as i have a adapter plate mounted

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if you mean the stock stamped steel plates, those are supposed to be less prone to leak then the 90 degree adapters
if you mean an aftermarket unit, like for a remote oil filter set up...you might be on to something