It is Kinda a Personal thing IF or IF NOT.. I have done it BOTH ways and prefer to go by the book.(.)
I use HD
filters and Redline FULL synthetic products (the best IMO) and find No Need to do my bike oil changes different than the book...
I have flowed out the oil, Like geezer has and on my sport with the tank UP on the side with oil lines on it I did get enough oil to exchange out of the system to feel a little better about.. BUT I change oil EARLY and never have OIL used long enough to really Call DIRTY...
After a ride I find the NORMAL Way works for me.
If you feel the urge to do the complete change
, You can find much to read about it,,,, I ALSO Just don't think it is as necessary to do..
Now with geeser, I respect HIS opinion and CAN see Why
HE does it His Way. If you want to it is a OKAY way..ALSO.