Just checking with everybody to find out if anybody has had any experience with the 20/50 lucas primary oil sold at oriellys and what due you guys think about running royal purple 15/40 diesel oil in the engine,im currently running royal purple 20/50 max cycle,but the price just went up or what about the regular royal purple 20/50.just checking for opinions since as we all know the great oil debate goes on.ive been a big fan of royal purple over the years and currenlty run it in all of my engines down to my lawn mower and leaf blower.also was in wal-mart and now see that they are selling mobil 1 v-twin oil in a 6 quart case for $53.92. Thanks for all your opinoins and advice,i dont post often on the forum but i enjoy reading all the advice given by glider and the rest of you on here,have a safe ride!!!!!!!