definitely use genuine oil filter, and i would suggest using genuine Subaru oil. Failing that Castrol fully synthetic 10w-30 (same as genuine). As previously stated a can of upper engine cleaner. Trans oil should be 75w-90 Trans axle oil, I would suggest Castrol Syntrax, must be GL5 minimum though. Do upper engine cleaner after the oil change as you need to rev the engine to clear it out, not a good idea with low oil

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i