I don't want to figure something out. I wonder if anyone bought some Pennzoil SAE 30 and did the cold test on it (the special equipment would be required) and reported the winter weight. The number isn't on the bottle but it does exist. The winter weight probably varies between different batches.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.