On of our Members said that the Hole at the top of that tube that goes down the Oil Filter Cap is there to allow Air trapped at the top of the Filter to get out (This is also whare the Oil that goes through the upper Bypass section of the Oil Filter goes.
As the Oil goes down that tube it has to go past a Check Valve #19 and after going past that ends up back in the Crankcase.
If it takes a long time to pressurize your Oil is
during your first start of the day it could be that the Ceck Valve is blocked or restricted and it is taking a longer time to get the Air out of the Oil Filter Housing.
If the Oil pressure takes a long time to build up no matter how many times you start the Car the 2 O-rings at the bottom of the Tubing may need to be need to be changed. A leak there allows the Oil in the Oil Filter to drain out of the Oil Filter Housing an back into the Crankcase.
