I think I messed up filling the BX23S with summer diesel that I had. After I filled it up, I was clearing snow and the tractor smoked and bogged down when I tried to increase the RPM. I immediately brought the machine back to the shed while still running at a lower RPM. Any insight or advice? I'm guessing that I need anti-gelling additive. The temperature has been consistently -10º C for a while now.