Change the oil in the jet pump cones. Tha's the oil they are talking about. You can use full synthic 75w90 gear oil or seadoo jet pump oil if you want to pay more .Change the oil injection filters and small lines for the oil pumps every few years. Make sure you put the same oil in the boat as the previous owner or your you need to drain and fill it up backup. Mixing different oils is bad. Make sure you use seadoo approved full synthic oil. You should have hose adapters that your hook to each enigne to run them at idel out of the water. Change the spark plugs after you run it for a little bit after storage. Check your bilge and blower to make sure they work since you need both to operate it properly.
It is pretty much all the same stuff as seadoo jetski's except for the blower and bilge pump sometimes.