Many have made good suggestions. This is what I used to do when we lived in Nebraska:
-Gas tank about 90% full; add Stabil
-Wash/Wax
-Change oil and filter
-Put large dessicant paks in trunk, frunk, and interior (paks bought on eBay)
-Fill tires to about 50 psi when leaving for storage facility
-Park car in storage unit, put in neutral, no e-brake, chock a wheel
-Pull battery (no power for battery tender)
-Put large towel over frunk latch so it can't possibly latch, gently close frunk
-Put car cover on
-Put 4-6 small mouse traps out, baited with peanut butter
-Lock door, check every week or so
-DON'T START IT UNTIL YOU'RE READY TO TAKE IT OUT FOR THE SEASON
That was my approach. Worked fine. No issues with ECU. (I kept the battery on a tender in my garage at home, BTW.)
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2000 Boxster S, 6 speed, Sport Package, Litronics, LED tail lights, LNE IMS-B, OBC, Skybreaker wind deflector, Arctic Silver/Graphite Grey
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