It looks to me if you have EZT hydros, there is no filter. I would still recommend a drain and refill. My RZT has a reservoir under the seat and each hydro had a fill plug on top. If you have an EZT, I am not sure if there is a drain plug. If not, you will have to remove the hydros and turn upside down to drain the oil. I used Castrol 20w50 in my hydros.