Synthetic filter rather than cellulose (cardboard) filter.
I wasn't looking for a pi**ing contest over OEM vs aftermarket filter quality. It's my money so if I want to spend a couple bucks more for a filter that based on my research is a better quality filter, that's my choice. There's enough other people out there using Wix and NAPA filters and having good luck without their tractors blowing up.
I was just interested in finding out if anyone else was using a M1-104 filter on their tractor in place of the OEM filter as the M1 is a shorter.
fair enough if that's what you think. might get more responses in the "oil, fuel, lubricants" forum as this really is not about kubota maintenance but the make up of oem (cardboard as you say) vs synthetic filter material. good luck