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I drive a new Chev Cavalier (2.2 liter Ecotec Motor which was introduced in the 2003 model). I live in an area where the temp dips to - 25 degrees celsius on occasion in the winter. I have been trying to decide whether to use regular Pennzoil Multigrade 5W30 motor oil or Valvoline Durablend 5W30 Synthetic Blend. According to specs the Valvoline has a pour point of -38C and the Pennzoil -44C.

Does anybody offer any advice regarding my choice?
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From the documentation I have (2003 numbers), if you are going to choose between the two oils you mentioned, I would go with the Valvoline. Results from the Cold Crank Simulator Apparent Visc. (ref ASTM D 5293)
Valvoline Durablend = 5800 @ -30 C
Pennzoil Multigrade = 6600 @ -30 C

The Cold Crank Simulator is a test which measures the speed at which a shaft can be turned within an oil that has been cooled to a certain tempature. The lower the number the better. The number is not the speed of the shaft.
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