Below is what I do with my 70 Beetle when I put in long term storage. I have removed items only applicable to the Beetle as well as added a line for coolant!
1. Put a can of fuel stabilizer in the tank. Fill the tank, run engine for 10 to 15 minutes to make sure the fuel stabilizer makes it all the way. Top off the fuel.
2. Change the engine oil
3. Change the oil filter
4. Consider replacing the brake fluid.
5. Consider changing the coolant.
6. Consider changing the gear oil
7. Clean the engine compartment
8. Clean the underside of the car
9. Inflate all tires to the maximum recommended on the sidewalls.
10. Fully detail the car, including a top quality wax job and dressing of all plastic and rubber parts. Park car inside of a garage.
11. Jack the car 1 to 2 inches so the tires do not hold all the weight.
12. Remove each plug and pour in about 1 to 2 ounces of regular engine oil or marvel mystery oil. Using the starter (remove coil cable to distributor since you do not want the engine to start) rotate the engine a few revs to get the oil on all upper portions of the cylinder head.
13. Put steel wool on the exhaust tip. Put a piece of plastic also at the end held in place with a rubber band. This is intended to stop critters from nesting inside your exhaust.
14. Using a large plastic bag put it over the fan assembly and air filter inlet to prevent critters making it in that route.
15. Remove the battery. Clean area; if you find rust treat it with POR 15 or equivalent. Top of the battery cells and store battery in a cool dry place (above freezing).
16. Get three plastic containers. Fill with cedar shavings, and then put in trunk, cab, and engine compartment.
17. Get 2 damp rid. Put one in the trunk and another in the cab.
18. Open the glove door and the ashtray.
19. Do not engage the emergency brake. It most likely will freeze on you during the long months of not being used.
20. Close the doors, trunk, and lid. But do not fully compress the rubber. This is specially important with the doors and rear hatch. Note: Dress all rubber gaskets.
21. Get a sheet of plastic and lay below your car. This prevents moisture that comes up thru the slab from causing any rust in your car.
22. Get a breathable cover and cover your car.
23. Check the damp rid and cedar shavings at least every two weeks and replace/drain as needed