K&N Black Oil Filters (Pack of 6) 1999-2009 Harley Davidson FXDL Dyna Low Rider / KN-171B The best! Don't use a cheap oil filter on your expensive bike. 50% thicker wall construction. Stronger inner core. Ok with synthetic oils. Check valve presents oil drainback and dry stars. New pressure relief valve. Has 17mm wrench nut for easy removal and replacement. Nut is drilled for safety wire. TUV endorsed and factory monitored.