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What oil weight and how many quarts does a 1964 gmc v6 truck use?

The 1964 GMC truck V6 used 2.5 to 3 quarts of oil depending on the exact engine and the oil filter used. The recommended oil weight is SAE 20W-20, or a similar weight appropriate for the climate you operate in. However, check your owner's manual for the exact specifications, as different models or engine variations might have slightly different recommendations. Older manuals may suggest straight-weight oils like SAE 30 as well. Using a modern multi-viscosity oil that meets the specifications from the owner's manual will be the best option.