[DeTomaso] Oil drain plug seal

[Dennis Valdez]

Hi guys and ladies,
Is it ok if I ask a question not about the POCA website or the BOD or copyrights etc.?  (Sorry just kidding!)

Anyway, I changed the engine oil and ZF lube this last weekend.   I discovered that my oil drain plug had been seeping.  It had a plastic washer on it so I changed to a copper one.   I tightened it as tight as I dare but it still seeps a bit.  Is there a torques spec for this somewhere?   Any ideas on how to get a tight seal?
 
Thanks,
Dennis