You can use any API-TC certified oil of your choice. Problem is... there are very few of them left since the boating industry has gone to TC-w3 Cert. The TC-w3 oils will not work properly in your engine, and will shorten its life.
You can use the SeaDoo XPS (Synth, Mineral, or Syth blend) Quick Silver PWC, or Amsoil Interceptor oils. All of those are known to work well in our seadoo's.