I am looking for an aftermarket hydraulic filter for a Scag turf tiger. The 10 micron Scag filter (48758) appears to be identical to a Donaldson P551551 which is also nominal 10 micron. Does anyone have experience using one of these as a replacement. The nearest Scag dealer is 100km away, so buying genuine is inconvenient. Cost is not a big issue as you dont use a lot of them, and I dont mind buying the original if there is a difference, but I dont think there is. I am also thinking of using Mobil 1 - 15w 50 instead of the standard 20w 50 mineral oil. Any advice greatly appreciated.