Oil line plug/ low oil pressure on cold starts

Oil viscosity at starting and even warm up is much much higher than at full operating termpertures.
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When the oil is thick, the pump can push harder, but the additional pressure is not getting more flow to the top.
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https://www.forabodiesonly.com/mopa...sub-zero-temperatures.488240/#post-1973404287
A 5W-30 will flow better cold, and flow the same at intended operating temps as a 10W-30, especially if its from the same company and product line.
A synthetic will usually flow better cold than the equivalent conventional.