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Make sure the oil-filler cap is properly installed. Some engines rely on engine crankcase perssure in order to run properly. If the cap is loose or improperly installes, this pressure may drop or not allow for the proper venting of crankcase pressures. You may also have PCV valve issues as well. Start with the filler cap and go from there.

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Q: Why car idles rough after oil change?
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To much oil in an engine can cause it to flood which will then lead to blowing seals. But it should not effect how the car idles.


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