The seadoo XP-S syn. is brown. I have heard of the older seadoo oil to be blue though, but not sure about that I have never seen seadoo syn. oil other than brown. Just to be sure I would remove as much of the old stuff as you can and just by a couple of new gallons of the seadoo XP-s syn. Your gonna need some extra for when you premix for the break-in after you rebuild.