I'm reminded of a friend's teenage daughter. Though she was conscientious, to her credit, about checking and maintaining the oil level in her scooter, she complained to her dad about how DIFFICULT is was to add oil! Yep, it's difficult if you add oil via the dipstick opening.
In the interest of gender fairness, however, I should probably include the same guy's son, who complained about the amount of oil he was having to continuously add to his car.
Why was he having to add so much oil?
Because, every time he turned on the ignition, the "OIL" light came on.