Here is what Kubota said regarding the folowing question:
Can I use synthetic 5W-40 oil in my tractor I have 150 hours on the unit? If not, can I use 15w-40 oil?
</font><font color="blueclass=small">( Thank you for contacting Kubota. Kubota has not tested and approved synthetic oils for their products. However, we have many current users who have had no problems. The automotive and truck industries are now moving almost entirely to synthetics. If this is your choice,choose a good manufacturer or distributor who can make an intelligent recommendation based on the use of your compact diesel engine. Your warranty will not be affected unless damage or failure results directly from the use of the chosen fluid. In these cases, the oil vendor should be held responsible for repair costs, not Kubota. Choose a vendor who will stand behind their product and there should be no problem. Again, thanks for contacting Kubota.)</font>
I guess I will use Mobil 1 10W-30 since it is CF rated for diesel engines, what do you think? /forums/images/graemlins/confused.gif