Anonymous
None. If it runs.
Anonymous
Depends on how long you ran it. My dad once overfilled the oil on a lawn mower. And there was oil coming out all the bolts it was kinda funny. I removed some oil but it's still leaking a little. Eventually we had to get a new lawn mower.
Anonymous
How much overfill are you talking about? 500 ml? Yes. 50ml? No.
The Devil
Damage Not very likely if you quickly shut it down and removed the excess.