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  1. red

    Changing out the coolant on the NHC250

    Heh not exactly cheap but they are a good choice. Much cheaper option, and if the fuel is not turned up will help alot with EGT control, is to add a turbo to the NHC250. 200-300F degree temp drop.
  2. red

    Changing out the coolant on the NHC250

    Applies to every internal combustion engine.
  3. red

    Changing out the coolant on the NHC250

    Out of curiosity, what are your EGT's at and for how long? Since these engines have been around in the 60's and 70's million miles has not been uncommon, including the small cam 250's. Military often neglects maintenance and abuses the vehicles which shortens the lifespan of mechanical...
  4. red

    Changing out the coolant on the NHC250

    Any film or sludge material in the cooling systems of the other engines? Red and green don't mix well and have some bad chemical reactions. My wrecker has green in it.
  5. red

    Changing out the coolant on the NHC250

    Did you go with the green, red, or grey coolant?
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