bkdrocks Posted January 18, 2010 Share Posted January 18, 2010 My 88 MJ 4.0 had a STP filter on it when I bought it(part #3985 I think),I bought a Wix and a Napa filter (51626 and a 1626)neither fit,but it was the correct part number.I bought another STP it screw right on??? I didnt know if maybe someone changed the filter base or if its a common problem.I need to post a pic of the filter base . Has anyone else ran into this? Quote Link to comment Share on other sites More sharing options...
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