Just came upon this thread and thought I would put in my 2 cents.
I personally use synthetic in everything ..(From my F350 Power Stroke 15-40 to the 8HP motor 10-30 on my sanders for winter 15-50 in the mowers both hydro and engines).. I have except my Kubota and only because I haven't researched to see what I should use.
I would like anything for info on what is the best filter to use though.
I have heard that the Purolator Plus is a really good filter and seems to be made well.