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This could be caused by the use of the wrong-size filter, by not tightening the filter enough, or by having debris which break the seal between the oil line and the filter.

Can also be you did not apply oil to the filter gasket. Can also be over-tightened the filter. Should be tightened 3/4 turn after making contact with the mounting surface.

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Q: Why is oil leaking when car is on over the oil filter?
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