Lew my opinion is if the plug looks good,it runs clean and strong,as long as were not talkin tons of spooge no worries.i switched to mx2t and even on hot days when perhaps running a tad rich there is a ring around the end or the silencer with a single drip trail 1 1/2" long on the bottom edge of the silencer.when temp/humidity right ,just the ring.all my signs show perfect,runs great,not sure what more i could ask.silkoline came w my bike,i used it till gone.ran sweet too but much more spooge?i never had a messy,splattering prob w either oil but i like the mx2t a lot.jmo