The dealer network is the best place to get your filters. The KIOTI flow rate is higher compared to most competitors, and aftermarket filters tend to restrict the flow, which can result in overheating your pump and ultimately could lead to pump failure. Using the KIOTI filters for engine and hydraulics is highly recommended. KIOTI lists a bunch of approved brands and weights of oils, other than their own, if you want to run a different fluid, but I would not run aftermarket filters. Hope this helps.