Coolant, coolant addative, and 193* thermostat. Per Gooch; 4 gallons of anti-freez concentrate (Add distilled water to finish filling). In agreement with International, who made your engine, I recommend a conventional coolant with SCA, or a pre-charged conventional coolant for the early 99's (pre-2/2/99). SCA (if using conventional un-charged coolant). Amount depends on the SCA maker (usually 3-4 pints).