Good idea changing your oil prior to storing your Z sludge is not good. I use a Battery Tender every year before I store my Z. 40 psi will be fine for tire pressure. I park on rubber mats it seems to work I never had any flat spots on my tires yet. Sounds like you are on the right track just leave your battery in your Z that’s what I do and just hook it up to my Battery Tender.
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Mr. Clean
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