Dropped the factory fill after 3 hours. From the look of the oil when I dropped it, there was a very high metallic shimmer. I always drop the FF within the for 100 miles on my cars/motorcycles. This is my first PWC and the manual advises change the oil at 10 hours. I changed at 3 hours with Kawasaki JET SKI 10w-40 oil for the next 5 hours. I'll keep posting all subsequent oil reports.