Originally Posted by ninos
He as a Cummings. Not a cat.
In the case of a 2000 Discovery the engine make, makes no difference. What matters is the radiator location, and this DP has a rear radiator! If the 300 Cummins has a breather tube and it's not extended it will contaminate the radiator just like a Cat. The solution is to bring the slobber/breather tube aft of the fan and fan shroud
Once that is done the method of cleaning a rear radiator is the same whether the MH is Cat or Cummins powered.