Oil & Fuel UDT vs SUDT,

[tdev]

Allright,I have been reading the argument about udt vs sudt oil for the last few years (since I bought my Gl3940C). It was time for the 400 hr service, oil,filters, ect, I ask the dealer what trans oil I should buy after explaining to him that I lived in a cold climate, sometimes 15 below. He explained that they came with UDT so I said fine and thats what I got. Well I done the 400hr service on it yesterday, this morning I needed to hall fire wood so I started the tractor up and to my suprise there was a whine, I let it warm up for about 20 minutes and it finaly quited some but still noiser than I am use to.It was 14 degres this morning,the point is I think it had sudt before the service because it was so much quiter. Next oil change I will be putting sudt thansmission oil back in it. UDT oil might be ok for warmer climates but in my opinion not for cold. I know this has been beaten to death but that is my experance.

 

[devildog1]

I totally agree with you. Here in up-state N.Y. our winters are quite cold and in the last two Kubota's all I will use is SUDT, when my new L3540 needs it's service SUDT will go in. Location, location is where the line needs to be drawn.
DevilDog

 

[Ford tractor]

UDT is pretty much straight 30wt.

SUDT is equivalent to 5w30. s=Super --> not synthetic

Next go round, get generic multi-vis trans-hydraulic fluid for a dramatically lower cost.

 

[Luremaker]

In Canada, we use Kubota Premium Hydraulic oil which is made for cold weather use.

 

[Stradbash]

UDT is pretty much straight 30wt.

SUDT is equivalent to 5w30. s=Super --> not synthetic

Next go round, get generic multi-vis trans-hydraulic fluid for a dramatically lower cost.

If we are talking Kubota fluids here..., there is a new version of SUDT which is called SUDT-2 and it is synthetic, or at least it says "Superior Synthetic Performance" on the label of the two jugs I bought yesterday.