Do a search...long list of threads on oil, lots o typing and lots o Opinions. I will say that you will always need to put 20/50 in the engine, the rest can get as complicated as you may like. You can research on AMSOIL, REVTECH, some kind of Purple stuff etc...... personally I go with AMSOIL.
thanks.....ok this may sound dumb but is there a difference between 20/50 full synthetic oil and 20/50 full synthetic motorcycle oil ? one says motorcycle the other doesnt....
Get the one that says for V-Twins, the other is probably for diesel truck engines.
Not that that its a bad choice, HD actually recommends it if your in a pinch and need to top off the tank.
But the one for V-Twins is blended specifically for the air cooled aluminum engine in your bike.