You could try Kubota UK, they are very helpful if you ring their technical people with the info you have. i put washing detergent in my Kubsta instead of red diesel (same coloured drum in the shed
)!!
On the subject of Kubotas does anyone know where i can get some KUBOTA SUPER UDT TRANSMISSION FLUID approx 2.5 gallon from. having real trouble sourcing any in the UK, found loads on American websites but nothing here or know of an alternative i can use. I have a B1610 to service.
cheers