Sounds like you have leaking inner crank seals.
I would suggest getting the oil out by grounding the plug wires on their posts, remove the spark plugs then cranking it over until you get the oil out. You will have to give the battery and starter time to cool and recover and it is going to make a mess when it comes out do have lots of rags handy.
Once it's out get it going and then see how many days it takes to fill back up. You might be lucky and it is just from sitting so long.