I don't think anyone knows when it "starts" to open and close... it is a 180deg thermostat so I think Mocal would try to convince you that it simply opens around 180. I have heard they are surprisingly accurate though. Assume that you always have partial flow and somewhere between 175 and 185 you have full flow.
Maybe in CA 60 degrees sounds cold but in NJ that is pretty damn warm lol. I think the point is that even when the oil is at 40 degrees you can still drive it, just be easy on the motor until it warms up that way you can be sure to have efficient lubrication. Normal driving on an ice cold engine won't result in failure or excess wear on a newer car, just keep it rational until the temps rise.
Those cold weather packages are "generally" on diesels because they need a higher starting temp to get the engine fired up. The Z wouldn't really get much benefit from them (plus who wants an outlet coming out of the front of the car).
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