I've been doing a lot of research on this subject the past day or so because I recently had to replace a defective crankshaft.
From my research I've learned that if you have a 587cc or 687cc engine, then a good, lower priced substitute for XPS brand oil is Quicksilver Premium which is rated both a API TC and TC-W3 Ashless oil, (not Premium Plus which is only a TCW3 oil).
If you have any other type engine, then Quicksilver PWC, either full synthetic (black container) or synthetic blend (silver container) meets Rotax engine standards.
SeaDooSkype and Dr. Honda posted some good articles on this subject which was my starting point.
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