Hi all, i know this has been belted from pillar to post as i have been reading all the comments about WHICH oil.As i am from down under we sometimes have difficulty in purchasing some of the oil we here about. So today out of my 05 heritage went all the mineral oil. In went. ENGINE. Mobil 1 v-twin 20w-50 synthetic. Finally found a supplier TRANNY. Castrol Manual Syntrax 75w-90 synthetic. PRIMARY. HD Formula+ now for the all important question, am i on the right track, any comments GOOD or BAD will be greatly appreciated. Thank you all for your time and help thehoggyboy.