I tried Castrol 20W-50 in the winter and the car was very hard to start. I went back to 15W-40 and the car starts fine in the winter - no problems.

Thanks for the advice. I did just change brands of oil from Rotella 15W40 to the LE Monolec or Lubrication Engineers dino oil. This is supposedly the absolute best dino oil you can buy. It is a red color and is run in the million dollar diesel earth movers. I am going to experiment and see how the oil consumption drops.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup