Bought a 2022 Benelli Leoncino 500 Trail that needs to be topped off in the coolant reservoir. It´s blue. Manual recommends ethylene glycol. One type of blue coolant is engine ice, which is propylene glycol. Everyone says don´t mix them. 1) Do I have to replace all the coolant and flush just to make sure I don´t mix the two types? There doesn´t seem to be an easy way of telling what´s in there now. 2) What is a recommendation for coolant brand/type for the Benelli engine? Thanks much.