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Re: What oil viscosity in fresh SBC in cold weather?
Unless you're using it very hard for some duration anything thicker than 10w40 is unnecessary. If I was gonna put 5w30 in any small block it'd be something like your scenario - fresh engine, cool weather, gentle use. The high volume pump should make it even safer to use thinner oil as it'll further guarantee good supply.
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Alex V.
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1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs.
1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.
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