I had to change an engine on a C210 a while back on behalf of the owner,It had a 8inch hole in the top of the case under the engine breather,The a/c belly and engine bay were remarklbly clean considering 12qts of oil once lived in the sump!!!It too had been run out of oil,Its good practice to check the oil during your days flying.Just because it was on 10qts on your daily inspection dosnt mean that their will be 10 qts in it after a long days flying.
Oil and Fuel are just as important as each other.At least you can always land with power if you think you dont have enough fuel,Once the oil is gone she will let go pretty soon after then it goes all quite from their.
Remember their is a colum on your MR for Oil added,Use it and cover your ass!!
Blue skys