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My Miata has trouble with cold starts as well. I did some research, and the recommended practice is to start the car and allow it about 20-30 seconds to get the oil circulating, and then go. They say that it is better for modern engines to warm up while operating rather than at idle like on older cars.
That being said, you still want to keep the revs down for about a mile or two just to make sure the oil is thoroughly working its way around, as many cars use oil pressure for VVT so it needs to be stable.
Of course if you start your car and let it idle while you clean the snow off that is still fine too, well assuming we ever get snow here again. WTB snow for skiing!
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