it is not a good procedure to just let a vehicle sit for that long,,at least once a month start the engine and run for at least 20 min (outside) ,also with the car in drive (foot on brake) to circulate tranny fluid,,use a battery tender also to keep up batt. charge,check air in tires also,,the brand of oil,get a full synthetic in the viscosity recomended for engine,,like Vavoline EP,Pennzoil Platinium Castrol Edge ,just to name a few,,,and lastly put out some mouse repellent so the wires,etc dont get runed by mice/varmint's,,,some gasoline conditioner is a good idea,like STP gas treatment along with a full tank.