If you were going to put the car away for 3 months then I would say it would be all right to leave the oil in it. But if its going to be stored for any long period of time 6 months or more than the oil should be changed and a fresh filter installed, you can even put in cheap oil if the car will be serviced before it is put back on the road.
The thing with leaving old oil in a car in storage is that there is a lot of containiments in the used oil and also moisture that can corrode or damage metal surfaces inside your engine.
The experts will tell you to actually change your oil before the car is stored for any long period of time, along with draining the gas tank, or at least putting Stabile in your gas. Tranny and rear end are fine to leave alone , just make sure they are topped off, before storage.
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