The two half moons on either side of the motor are oil holes, while you can drip 2-3 drops in at the cover depth. I have a oil tube contraption that is put in the hole and it delivers the oil at shaft depth, no foolin around, ya know?
The combustion motor (a fasco in my pocono) also has two,one of them is inside a tiny metal box where the electrical terminals are , you need to remove all power from the stove (safety) first and then open the box up, you'll see the half moon in there.
I'm assuming that these holes are circumferentially positioned so the oil will drip in by gravity, your combustion motor in the pioneer may be different though in my poke they are easily assessible on top sop gravity can help the drop go in..
Consider vacumning the motor and half moon oil holes to remove dust before oiling.