I would not use 30 W oil, but 5w30 or 10w30 or 10w40 should be fine. I have 230,000 on my truck and I use 10w30, but like I said, it never gets cold here. Maybe in the teens for a day or two, once or twice in a ten year period. then it warms up. It also almost never snows here. It may have snowed here 6 times in the last 60 years, and in those 60 years, it may have stuck to the ground 3 times. Also keep this in mind. These engines were built to run conventional oil. synthetic is grate, but will clean so well, that if you have a slow leak, it can get worse with synthetic oil. IMO sythetic oil is grate in an aluminum engine, but in a cast iron block with cast iron heads, conventional oil is fine.
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