OK, I know this has been discussed endlessly, but please help me. I have a ZG23 mower and a L4200 tractor. I want to just by one kind of oil for both. Both the manuals say the exact same thing. it says use UDT or Super UDT. It doesn't give any spesific reason for using Super over regular. I know some people say use The super when it's colder out or if you have hydro (I have GST, same thing). My dealer doesn't even sell Kubota oil. He sells some generic brand, but he has tractors in there all the time with transmission problems and it makes me wonder. I think the dealers sell whatever oil makes them the most profit. Now there's dozens of oils that meet the UDT specs, but only a couple that meet the Super UDT. Without getting into a brand war here could you please give me a reason for spending the extra $$ to buy the super.