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As Jim mentioned above;

Pontiac Service News Flash number 64-16 (10-18-63) and 65-53 (12-22-64) verified that the oil capacity on all Pontiac V-8 should be five quarts - six quarts with filter change. Some 1964 models were manufactured with a four quart dipstick; the five-quart dipstick , part number 9776085 (code MF), should be installed.

Also 389´s used a longer oil filter, at the time, with approximately 50 percent more oil in it than oil filters on 1967 and later engines.
 
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