Stacey,
The fuel-oil voucher indicates that VP MS-98 fuel must be used, and that at least 4 oz of oil/gallon must be used. What about for Rotaxes? As you know, we normally use MS-93, and 2.5 – 2.9 oz of oil (for 44:1 to 50:1 ratios). 4 oz is a 30:1 ratio–WAY higher than Rotax ever recommended, even back a couple years ago when they were worried about engine failures (and in the midst of summer).