as far as I know you should run the mower until it runs out of gas and
stops,
and then drain all the engine oil.
That said, I myself rarely do that but I swear that i will do it this year.

"Brigitte J." wrote in message
...
I have 2 gas lawnmowers, and I have no idea what I need to do to them, so
that they will operate properly in the spring when I'll need them again.
Should I drain the gasoline? Put in an additive? What about the oil?
Does
it need to be drained? Any suggestion/advise are greatly appreciated.

Thanks,
Brigitte J.