Current measurement of oil flow behavior at very low temperatures (-40C/-40F for example) is insufficient. Here is a proposed (economical) approach to correct the deficiency.
https://www.thefreelibrary.com/Estimation+of+oil+supply+time+during+engine+start-up+at+very+low...-a0478823009
https://www.thefreelibrary.com/Estimation+of+oil+supply+time+during+engine+start-up+at+very+low...-a0478823009