Bored are we? ;) I'd strongly recommend draining your oil, unless you fancy a nice big oil clean up.
blown head gasket
NO cant be done
Not possible without dropping gas tank and draining it that way.
Any where from an hour to an hour and a half with out draining the players is a good time for drills warming up and stretching.
Add Chem Out by Bioguard or any chlorine neutralizer.
7 1/2 quarts
You probably can but you would have to neutralize the exes acid after you were done with some sort of base
There are ways to clean without draining or running through your filter but they would include the use of a separate filter which would be as much hassle.I would recommend draining the pool and lightly acid washing to properly get out all the mud and bacteria it may have left behind.
You cant realy acid wash a pool without draining it as it takes a fairly strong solution of acid to clean the surfaces in a pool. However you can usually do a very nice job of cleaning the pool with a presure cleaner and fresh water.
This can be a sign of a bad compressor and you will need to run a compressor check first, this can be done without draining the freon....