Re: Shellzone Coolant for 97 Diesel
ASTM D4985 is the standard spec for low-silicate coolant for heavy duty engines. The ASTM D4985 coolant plus an SCA (either DCA-4 or DCA-2) is what your particular build date engine would require. So by adding SCA to that heavy-duty low-silicate coolant you're good to go.
Note: If you see ASTM D6210, it is basically ASTM D4985 with the SCA already in the coolant (ASTM D6210 = ASTM D4985 + SCA): Typically called pre-charged. ASTM D3306 is just the most basic standard spec for coolant...you'll need more than just that spec alone for a diesel.
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