Well, I'm at the point where I need to change the fluid.
I heard so much about Kubota SUDT2 I called the local dealer ; $101.85 for a 5 gal pail. Full synthetic Multi-grade
I called my local Kioti dealer and they carry (and use in the shop) Wolf's Head (
http://www.wolfshead.com/assets/6b_wolfshead-tractor-ht-111128.pdf) at $60/5gal. A conventional multi-grade
And Summit has the two pack of Mobil 424 for $69 + $10 s/h = $70 for 2 - 2.5 gal. (with a $5/2.5gal rebate) Net cost=$69 However it' PDS doesn't state it's grade/weight. either multi-grade or ISO. (a call to Mobil Tech results that it's an ISO46 = 20w)
I've been using TSC Traveller UTF but found it's a single grade, ie ISO46 = 20 weight. And my HST CK2510 seems to whine a lot, especially when cold and in hi range.
BUT TSC also carries Rotella HD (a UTF) which is a 10-w30 grade rated GL-4 for $58 + tax.
With winter coming (here) I think I'm going with the Wolf's Head or Rotella. SInce the Wolf's head is closer and cheaper, it's the winner.