Using Synthetic Oil v Semi or other

Some Help / Advice please
I'm about to change the oil in my ZZR1100. Only got 7500klm and was last serviced around 3000klm.
I intend to use a Synthetic Oil , but not sure what is in it now.
My question is: Would putting Synthetic oil in over what could be Non Synthetic make a difference? Assuming the filter is changed as well?
Cheers
I'm about to change the oil in my ZZR1100. Only got 7500klm and was last serviced around 3000klm.
I intend to use a Synthetic Oil , but not sure what is in it now.
My question is: Would putting Synthetic oil in over what could be Non Synthetic make a difference? Assuming the filter is changed as well?
Cheers