I have nothing to add for storage. However, when you come to start it up again, remove the sump and clean it. My LS3 is a 2009 and has had brand new
oil in since then. When i took the sump off to modify it there was a sludge that had settled in the bottom of the sump. I was concerned when i first saw it, but i think it is just the
oil settling out over time.