PSI is the MOR, Manufacture of Record, for the engines emissions system. It can only be the one of the manufacturers.
GM and Mazda have dropped their industrial engines and NACCO has gone to PSI for their alternative. The PSI 2.4 will be standard and the Kubota will be the Premium option. Sure looks like a Mitsi base.
The problem is trying to keep up with emission regulations.
MCFA used Nissan engines for some models.
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