Changed my oil today and when I pulled the oil filter out there was a piece of plastic on top of the filter. After looking at it it seems as if this plastic piece belongs on the actual screw on cap it self? The center of it looks like something is missing or broke. I removed it off the old filter and placed it on my new one. It went together fine but just dont like knowing that something in there isnt perfectly the way it supposed to be. Has anyone seen this or had this problem? Am I taking a chance of messing something up in the engine?