dont understand your question if your asking me? i'm saying there shouldn't be any pressure coming from the pan and or lower end, i.e. out the dipstick tube, you should have normal cavitation of oil but if you have pressure coming out oil cap it could be from blow by or psi getting by the rings and into head

 

well if you read my post corectly its says its not pressurized it sucks in when i take out the dipstick not blow out.

 

pardon me, it was hard to make out "piiiiiw". wasn't trying to ruffle any feathers, and no, vaccum isn't normal from a dip stick