Before putting away in the fall, run the vehicle so that the engine oil, transmission fluid and differential oil are up to normal operating temperature (normally 20 minutes at highway speed). Put the car in the garage, pull a battery cable, put the sun visors in the down position (so that mice don't have a platform to stand on while they eat your headliner), make sure manually operated outside vents are closed (to keep mice out), lock the car, close the garage door. Done. Been doing it this way for 30 years with no problems. No fuel additives required, no last minute oil changes, no jack stands to keep the tires off the ground, the list can go on and on..........