Stop in for a cup of coffee

First - do what TJ suggested - check for whats in the hole.
Then do some measuring. :poke:
Your drill bit set can be used for pin gages - unless you have them new fangled ones..

Before you get too far down the path , one of the things to check is the dipstick length and tube combo puts the mark at the 4 qt level in the sump.
Never assume!