Sounds like winter engine related work is a no no.
Why not? Best time to do prolonged service items as you cannot use the car anyway, so waiting for parts is not a concern.........
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
I put snows on my Cayman and drive her during the winter. I put the Box away around Thanksgiving and get her out in late Mar. No battery tender. Somewhere in between those dates I'll take the Box out for a 30 min drive when the roads are dry.
I start either one and drive right away, keeping revs below 3K until they warm up.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black