Untitled Document Oversize M13x1.5 Oil Drain Plugs to repair M12 x 1.5 stripped sump threads. NB: THESE ITEMS ARE NOT SELF TAPPING AND REQUIRE AN OVERSIZE THREAD TO BE MADE. Please see link below for Reamer Tap to clean and tap M13x1.5. 5 M13 x 1.5 sump plugs complete with copper washers supplied. Click link for suitable Reamer Tap.