Okay, I will try to explain the "warming"
Moisture wants to migrate to the coldest place around. in the old style refrigerators you had to periodically "defrost" or remove the built up ice. moisture migrated to the coldest place and stayed there.
You don't have to have the engine hot, just a couple degrees warmer than the surrounding air to prevent the moisture from condensing on and in the engine.
Obviously a small amount of moisture in the oil is not immediately catastrophic. It will live with it and survive.
When my Wee is home there is a batt tender plugged in at all times.
I baby my motors
Cheers
RLBranson