Change the oil, top the tank up, and if it's not going to get moved at all put it on jack-stands so the tires are still round when you're ready to use it again.

__________________
1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k