My understanding is the Travellers UTF is a premium fluid.
My Kioti dealer sells Xtreme UTF which, from my searching, does not spec as well as the Travellers. I intend to use Travellers on an upcoming service for my Kioti HST.
I'll be doing the 50 in a few weeks.
I had to rob a few liquor stores to pay for all the filters, so it delayed me a bit.