g'day davisi would say its condensation i had the same problem recently when i changed my oil when i cracked the drain plug i got about a cup full of clear water then oil no water mixed in with the oil no green so it wasnt from any water leaks & this is a daily driver i havent used it for 2 weeks now & its done it again.
your oil pump if its next to the oil pick up tube on the pump then your oil pressure by-pass valve is missing. hope this helps