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Why is air sucking into oil fill on 1999 Ford Mustang?

Updated: 8/20/2019
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11y ago

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Because there is a vacuum in the crankcase. There should be a slight vacuum due to the positive crankcase ventilation. If there is excessive pressure or vacuum, you have ring blow-by, meaning your rings are shot.

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11y ago
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Q: Why is air sucking into oil fill on 1999 Ford Mustang?
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