What was the factory oil weights recommended for a 1970 Chevorlet c20 pickup?

The factory-recommended oil weight for a 1970 Chevrolet C20 pickup was typically 10W-30 for most operating conditions. In colder climates, 5W-30 could be used for better cold weather performance, while in hotter conditions, 10W-40 was also an option. Always refer to the owner’s manual for specific recommendations based on the engine type and operating conditions.