I took samples from the various straight weight motor oils in the garage and looked at them after 24 and 48 hours at 0F. After 24 hours Coastal 30 ND (SA) rubbery solid, with visible streaks of wax Napa 30 ND (SB) lightest in color, barely pours Chevron Supreme 30 (SL) barely pours Chevron Supreme 40 (SL) barely pours, no different than the 30 After 48 hours none of them pour. The pour-point depressants must only delay the formation of wax crystals for so long. There was no visible wax in the samples (except for Coastal). After an overnight thaw in the refrigerator compartment (40F) they all flowed surprisingly well (except the Coastal).