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I agree with Mistamatrix, if you want really good low-temp behavior, synthetic is your best bet. It behaves the same when warm, but doesn't get so thick when cold. This is exactly what a 0W30 oil does: It behaves like a 30 weight oil when warm, but behaves like a 0 weight oil when cold. All oils get thicker when cold, and a 0 weight oil (which is very light) is still thicker than a warm 30 weight oil, but not SO much thicker, and this is nothing but GOOD for your engine. So a 0W30 synthetic would be great.
I ran synthetic a couple of winters in my old Saturn. The engine started and sounded "normal" down to, say, 10 F, but below 0 F with 5W30 the engine made funny sounds, like I could hear the valve train clattering for several seconds, and the engine felt like it was really loaded down and working hard to keep going for a first minute. But the two winters I ran synthetic (which was 0W30 I think) it started and sounded "normal" even at -10 F! We even had one morning at -18 F, and it started right up and had a perfectly normal sounding high idle, no valve clatter, no bogging down.
The theory is that thick oil doesn't pump well, so the valve train runs a little bit dry for a few seconds when the oil is thick, and the thick oil around the moving parts puts a heavy drag on them, making the engine have to work hard to keep going. But the synthetic oil flows well even when cold, so a REALLY cold start is just like any other regular cold start. I definitely found that to be true. And since it is a 30 weight oil when warm, it behaves just the same as normal 5w30 the vast majority of the time.
I have a garage now, so on the really cold mornings the car starts out at 40 F, so I haven't bothered with synthetic in my Matrix.
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