SKU 9779485. The 4T 5W-40 Full Synthetic Oil Change Kit for Rotax 900 ACE engine provides you with everything you need to change the oil of your watercraft yourself. Easy to use, the all-in-one kit includes XPS Full Synthetic Oil, an oil filter, o-rings and a washer. Tested and designed to improve the performances of your vehicle, our XPS oils last longer and protect your engine better than other oils.