I just changed the oil on my Civic, and this time I'm using an OEM Honda filter. Something felt weird when tightening it .. I've used Honda filters once or twice before but I can't remember if they worked this way. The tightening instructions printed on the filter are pretty standard -- 3/4 turn after gasket contact. What's weird is that I made gasket contact, proceeded to turn another 3/4, and at that 3/4 point the filter immediately got really tight, and I couldn't tighten it any more. With other filters it seems like the norm is that it gets progressively harder to turn, instead of suddenly getting hard to turn. The gasket on these filters has a circular cross section instead of rectangular like most filters (i.e. the contact surface is round, not flat). Does this give the gasket more bite when it becomes compressed? I don't really think anything's wrong (although I will check for leaks after a short drive tomorrow). Has anyone else noticed this behavior from Honda filters (or others that might have rounded gaskets?) If it's intentional then I think it's a pretty cool feature -- makes it really easy to get the correct torque. EDIT: Just to be clear, the filter isn't cross threaded or anything. It came back off just fine and I tried to tighten it 3 times. Each time it got tight "exactly" at the 3/4 turn mark past gasket contact.