Winter oil

[Carl W French <cfrench@cybertours.com>]

  This is the first winter my car will not off the road for some major 
work. I plan on using it off and on during the winter. I have noticed that 
it does turn harder and the oil pressure is lower when below 25f.
Would I help/not hurt the situation if I went to a lower viscosity oil for 
the dead of winter? Maybe 5-30 or something else. Thoughts?

Carl French
67B
80B