Sierra 18-7897 Oil Filter Sierra Oil Filter Meets or exceeds the original equipment quality Sierra part number: 18-7897 Interchangeable with the following: Evinrude/Johnson 5033919, 778887, Mallory 9-57815, Suzuki 16510-82703 Thread Spec: 3/4" x 16 or 19.1mm x 406.4mm NPT