What would be a good viscosity of oil to use in my 216 motor for Winter weather?

I probably would not start it up if it were any colder outside than 30 degrees but I'd like to use a modern multi viscosity oil like say a 10w 30.

I get days in the forties through out the winter and want to use the truck on those days but think that straight 30 weight would be a bit hard on the six volt starter.

Suggestions ?


1945 Chevrolet G 506 1.5 Ton Military 4X4
1967 Jeep Cj5 with 283 SBC