I did an oil change on my Aunt's van yesterday. When I refilled the oil, I put in about 5 quarts of oil. When I poured the old oil back in the container, it was only about 4 quarts. Now when I check the oil dipstick, it reads above the full mark. Can I drain some of the oil from the engine by loostening the drain plug, or do I have to drain the whole thing and then refill it again?
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