Just asking but why would you want to change from synthetics to mineral? If you cant stand the retching smell of the BRP synthetic just change brands..
No, he does'nt have to drain the reservoir, all 2stroke oils will mix with synthetics 2 stroke oils. And BRP oils are manufactured by Castrol.A friend has a 550 cc fan cooled '05 GTX and wishes to use lower cost Castrol snowmobile oil.
Does he have to drain the reservoir first? Or can he just throw the regular Castrol oil in with the existing BPR synthethic oil?[/b]