The only time I gelled was when I had "summer" (straight #2) fuel in my backhoe and forgot to treet. Outside temp was about 15*.The hoe stopped dead in its tracks as the gelled fuel won't go through the filters. Change filters as wax plugs the filter paper. Tarp tent around hoe, space heater to warm unit up, generator to run space heater.Froze my ***!Learned my lesson, in 30 years never did that again! I can second your post, Deerlope, in 40 years of running diesels in temps down to -20* I have never gelled with winter 50/50 mix. I agee the tranny is stiff until it warms up. Any one know if Kubota's fluid is synthetic?