After trucking from Alaska to Miami and all points in between for over 35 years and running in all kinds of weather cold and hot and owning diesel pickups since 1994 and buying hundreds of thousands of dollars of diesel fuel over the years I have seen my share of trucks gelling up in winter. One night a guy I was running with had his truck gel up at -20 and he kept saying as he tried to sleep in the front seat of my Peterbilt as I slept between the sheets of my warm sleeper....WTF... they told me it was winter blend lol. When it hits 0 put some Power Service or FPPF or Howes in your fuel !!!!! As far as a diesel starting in -0 temps no proplem with these newer diesel motors.....at all.