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. Any ideas?