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Whatever it takes to fill it up. Park the van on a level surface, drain the oil and change the filter. Add 4.5 quarts and start the engine. Let run for 45 seconds, and then shut down. Wait 45 minutes and check the level. Add enough oil to fill it up to the full mark. You now know how much it requires.

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17y ago
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Q: When changing oil in a 1990 Chevy Van How many quarts do you pour?
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