After my son totaled my first e39 I replaced it last year(same year). I had an oil filter left from the first one so assumed there would be no issue (having used this type/model number filter in my other 02 M5). Welllll....this one has the same screw on filter cover but the filter itself screws into the base and is closed at the top. The cover has nothing coming out of its center. When I look at pics of 02 M5 filters they all look like the one I have (open top and bottom with no threads anywhere). Can anyone tell me what is going on (and what filter I need...)?