oil blowing from the dipstick and oil cap

Hi all

I'm back again thanks to everyone that contributed to my other thread you were all very helpful, now this spaceback drives lovely (having said that due to problems ive only done 20 miles in it) so i decided to do a oil change which all went well except i couldn’t see the level so worried about it not being enough put 500ml more and i could see it i(i put a 4lts in in the beginning, then added the 500ml, but while i was sorting out i had to move the car a few meters to let my wife’s car in and inadvertently left the dip stick out and oil came spouting out so Ive read a bit about it pcv valve and a few other things it could be, if anyone has done one or knows some information that might benefit me it would be greatly appreciated.