Those are the exact same specs in both my RTV manuals and the M126 manual. It appears that Kubota has a generic oil recommendation that they havent changed to keep up with the times, especially since their own oils are now rated in the CJ-4 category as well, as you said. Im sure I am...
I was considering switching to Rotella T6 5w-30 on all my diesel equipment (2 RTV1100s, Kubota M126, 2001 ford 7.3) but i saw a thread on nettractortalk that stated the manual for Kubota says not to use CJ-4 rated oil in non DPF engines. In the Lubricants, Fuel, and Coolant section, it just...