I used a large piece of cardboard to cover my whole raditor, but didn't cover my oil cooler. Heat, warm-up,and engine temp all were normal for the winter. I had fair heat until I did this. With the fuel changes and the extra idling...we all lose milage in the winter...except you guy's that don't have a winter.

__________________
1983 300SD 343K everyday car
1983 300SD 285K from junk yard-tooks parts from deer car- runs great. Brothers car.
1984 300SD parts car-Hit deer
1979 300D 175K non-turbo "Doctor"
1979 300d parts car