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Capacity Provided it has a stock oil pan the capacity is at least 5 quarts and full level is about 6 quarts. Use A healthy '64 389 could burn a quart every 1000 miles. Many Pontiac V8s suffer from bad rear main seals (poor original design) which allows them to leak a quart every 300 miles or so. To diagnose a bad rear main seal have someone drive behind you at highway speed. If your seal is bad you'll know because the car behind will have curious tiny little oil dots all over it.

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Q: How much oil does a 1964 Pontiac 389 need?
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