the name of the thread is what i would run in your ski, XPS II FULL Synthetic Oil, (the yellow jug), and the easiest way i would do it is, remove filter, and catch all the old oil that comes out with cups, (cause it could get messy), lay some rags in hull first, then put new filter on it, and fill tank, then here is a pic of an oil pump , loosen up oil pump bleed screw and let it bleed out till no bubbles seen in your line going to pump, then start it up, cause your other lines going to motor already has oil in em -- unless you changed them