I'm sure this has been talked about but couldn't locate the thread on this forum. Being that I'm in Canada I can only get UDT from Kubota. When I asked them about SUDT the dealer tells me its not sold in Canada due to the climate. What? So now Canada has no weather equivalent the the US. Not buying the answer. If SUDT is indeed a better fluid, as in fully synthetic, I'll get some from the States when the travel restrictions are lifted.