I stored mine outside with a cover and battery tender and did nothing special but then I probably used it every 2 weeks and always drove it 20 miles start to stop. 5 years and temps to about 20. If I were to plan to go multiple months without using it, I'd do the full treatment with oil change just prior to storage, full tank, stabil, tire pressure, anti-desiccant, moth balls, battery tender, tire insulation boards, sealed openings including exhaust pipes, etc.
Pay attention to the tire type and the outside temps. I didn't and it cost me my first Boxster.
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