Stabil is a good product to use. I have stored my celica the last 4 years with it. Follow directions & fill tank with gas then add appropiate amount then drive around to make sure product reaches whole fuel system. As far as the oil change, you should be fine with what you are going to do. Here are some other things to do: crack windows slightly to let interior breathe, put open box of baking soda to absorb any moisture or odors, DON'T engage emergency brake, pump brakes once a month & run A/C, remove battery from vehicle & charge with trickle charger - (Don't put on concrete floor), put car cover on car after washing & waxing, plug exhaust with steel wool. Hope this helps.