Will it hurt my motor to go from full synthetic to semi synthetic.it on a 16 ultra with 103

 

NOPE,just pour it in with a new filter, Done

 

Welcome to the Forum

You should be fine

 

nope, not at all. It would be like going from a group 4 synthetic to a group 3 synthetic or even going to syn3. all good oils for a Harley v-twin motor.

 

most off the shelf syn oil is petroleum based anyway, the purest being derived from natural gas.

 

No that stuff is all a myth with oil should use the recommend weights but as far as syn back to regulars no problems.