I have a kubota gl11000 genset with the factory fill coolant, going on two years. I figure it's time for a change, looking for some guidance. The owner's manual doesn't provide any coolant specs I can find, which brings me here for some help. What type of antifreeze should I use? The factory fill is dark green and transparent, it kind of reminds me of honda coolant in appearance. This is for the d722 three cylinder diesel.