I do doesn't  seem to help ,   not really  concern  about the hard starting when temp  is below  20 degree  as long as it starts in a few tries ....can in stall a block heater to help in this matter.  Some diesels  are just hard starting ...
What concerns  me is burning off the fan belt..after it starts...there are times when I need to leave tractor  where I have no access to  electrical  power...