If you're going the change the oil now, it would be good to warm it up before draining. Then fill with fresh and run it for a few minutes and it's ready. Store with oil full is fine. Lithium is fine in your basement. It's gusty today, only 15-20 mph here and 39°, wind chill feels like 20. Will get to 18 by morning. Not a record for here, but it is very rare. Only a few times has it gone that low that I've seen. I'd prefer 120.... lol