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Any Mobil 1. 10w30 should be fine. The viscosity rating on synthetics are just about warranty requirements. Read a 15w50 and a 0w30 and they all say they flow at -48 degrees. I talked to a Mobil 1 rep and he told me it's for warranty requirements they all are the same oil inside, synthetic doesn't thicken at low temperatures like dino oil and has a much higher resistance to heat as well. I found this out when I was using 15w50 for the summer and 10w30 for the winter on my turbo, then I just used 15w50 all year round.
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