storing your beloved mopar

I was told by my brother that the oil will sink to the bottom of the engine and will damage the engine if you start it up once a week over the course of a winter storage (4 months or so). I am curious if this is true and why should you driain the coolant and plug the exhausts? Getting ready to store the Demon 'til spring or atleast 'til the next decent day without salt or snow on the roads,
D340