I store my Porsche every winter and have done this over the last 9 years with both that I have/had owned:
1. Change the oil. As stated by others the acid etc will cause problems over the winter. No need to change it in spring. Just start the vehicle up and let it idle for about 10 minutes. Drive it slowly till it fully warms up. Any water in the oil would have boiled off by this time.
2. Wash and wax the vehicle. Get a good cover for it and if it is being stored inside, leave the windows lowered by about an inch to keep the interior fresh.
3. Disconnect the battery after you have fully charged it. If it will be stored outside it's better to bring it inside. I have seem battery tenders that fail and kill a battery.
4. Over inflate the tires to maximum pressure it will take. Get 4 pieces of styrafoam about 2" thick and park the vehicle on top of this. This way the added pressure and the styrafoam will not cause flat spots. Newer tires it is not a real problem as one they get up to operating temperature (warm) the flat spot disapears. It's best not to jack the vehicle up as the suspension needs a load on it to maintain it's self. If possible lay a tarp down to keep the floor clean and reduce the condensation under the vehicle.
5. If not a secure location, put some steel wool in each tailpipe to keep the mice out. Nothing is as funny as seeing mice bodies being blown out the exhaust pipes when the motor is under load ...
6. I place a volcanic air freshener inside to keep the odors out. Thiese can be bought at Lee Valley Tools.
7. Fill the tank with non-ethanol gasoline such as Shell or Husky 91 octane. If it's a metal tank fill it up to keep rust off it. If it's plastic, a quarter to half tank is all one needs. You want to add fresh gas in the spring to keep it running well. Ethanol gas has a tendancy of absorbing water which will cause issue. You need to minamize this. EDIT: Add fuel stabil to the tank as well.
This is the standard set up at most storage outfits that handle vehicles from high end to bikes and everything in between. I have had years of good results following these steps. Hope this helps.