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Toc much preasure or even heat and preasure. It could be the gasket/ seal surrounding the oil filter aswell. You should change the oil filter, gasket/ seal and it should not leak.

Are you 100% sure the filter is leaking or possibly oil is running off the filter but is possibly coming from above, as in a leaking valve cover gasket. If the filter is indeed leaking it can only be a few things. Either the filter was installed incorrectly or the mounting surface was dirty or the old filter gasket was left on. Remove the filter, make sure the old gasket was removed, clean the mounting surface throughly, and take a close look at the surface. Make sure there are no scratches or pitting there. Now apply a light coat of oil to the new filter gasket. Install the filter and tighten it exactly 3/4 turn after it makes contact with the mounting surface. (NO MORE AND NO LESS!!!) I stress, 3/4 turn. This is where most people make a mistake and tighten the filter way too much. It may not feel tight enough, but I assure you that it is. After the filter gets hot, the gasket will swell and it will be plenty tight and create a good seal but be easy to remove the next time.

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โˆ™ 2008-12-01 03:39:30
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Q: What would cause a 1987 Chevy 305 to leak oil out of the oil filter?
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